Special Weapon Effects (Borderlands 2)

Pistols & Revolvers

 * De Da.,Law: 100% Accuracy while zoomed. (Quest Reward, "Won't get fooled again")
 * Havin' a tea Partay drinkin' mah Teeea!,Teapot: Corrosive effect spreads to nearby enemies (Quest Reward, "You Are Cordially Invited: Tea Party")
 * I am free now, Unknown All current sightings are Revolvers.
 * Whenever I'm caught between two evils, I take the one I've never tried,Miss Moxxi's Rubi: High elemental chance, reward from Moxxi (Quest Reward)
 * Would I lie to you?,Fibber: Inaccurate stats displayed. Fires 3x medium speed rounds, consumes 2 ammo per shot and has +50% love, +3000% damage. (Quest reward)
 * Shoulda stopped at one, Veritas : +10% duration to Fight For Your Life for every Aequitas or Veritas equipped in the party. (Quest Reward, "Clan Wars: Wakey Wakey") 
 * Good at starting fires, Flynt's Tinderbox High chance to cause fire effect
 * Thinking outside the box, Gwen's Head Dahl burst fires 9 instead of 3
 * Fear the Swarm!, (Dahl Hornet. High Elemental Effect.) Unknown
 * Love is a lady finger. True love is a lady fist. Maximized lady fist - deals 10X damage on crit. High magazine count. (Quest reward, "Uncle Teddy")
 * Can I have such a thing? Thunderball Fist - shots fire a blue orb which does shock damage and explodes after a few seconds.
 * Dodge this., Dahlminator: Fires ricochetting projectiles, that stick to enemies and explode, Corrosive? (Quest reward, "The lost Treasure")

Shotguns

 * Because one barrel aint enough and two is too few, Thre Dog: Three barreled shotgun.
 * Good things kill in threes.: Consumes 3 ammo per shot, ridiculous high damage and number of pellets. Pellets fire in an inverse Y shape.
 * I don't want to set the world on fire..., Miss Moxxi's Heart Breaker: Fire damage and +50% critical damage. Shoots in a heart patern. (Quest Reward, "Safe and Sound")
 * I like being a gun., Asset Shotgun 1340: Has Dalek-like voice and personality. (Quest reward, "Out of body experience")
 * Let's just ping everyone at once., Potential Conference Call: Low-pellet-count, high-damage shotgun whose pellets move at a very high speed (Almost instant) and ricochet.
 * Also try Minecraft!, Sunny Blockhead: Deals fire damage. Fires 9 pellets in a square formation. Pellets ricochet off walls.
 * Octo means nine...,Octo: fires 8 pellets in 3x3 pattern with centre left pellet missing. pellets are slow moving and fly in an inwards-outwards pattern while leaving yellow orange trails.
 * Kiki got a shotgun, Original Deliverance: Throws the shotgun during reload, shotgun will home-in on a target and continue to shoot occassionally until impact upon which it will explode. (Slot machine: 3 vault symbols) or (Drop from special Skagg creature)
 * Don't retreat, instead reload: Ammo Regen

Combat Rifles

 * I want that gun, daddy!: Spread decreases while zoomed. (Dahl "Feral Veruc" found off a named NPC on "The Good, the Bad, and the Mordecai")
 * Say not in grief: "He is no more," but live in thankfulness that he was.: Quest reward for "Bearer of Bad News" (Dahl Scorpio) Occasionally fires multiple rounds. Extra shots still consume ammo
 * Evil will be SMASHED!!! WITH SMASHING!!! EVIL!!! SMASH!!! ER!!!: Unknown effect - has custom skin, covered in doodles and stick figure art. (Quest reward, "The Chosen One")
 * What play thing can you offer me today?: Bullets are fired at a 45 degree angle upward, causing the bullets to land ~30 meter away minimum unless aiming down into the floor. The rounds also split into two projectiles after some distance and resemble fireworks when shot for prolonged periods. It's normal non-zoomed sight is also switched to a range markers one with no actual crosshair. (Name: "Corrosive Hail", Quest: "Bandit Slaughter: Round 5")

Sniper Rifles

 * Bison Bison had had had had had Bison Bison Bison shi shi shi - Chikamin Buffalo - very high damage and accuracy as well as increased stability, but slow RoF and lacks a scope. (Quest reward)
 * I can see my house from here. - Increased zoom level. (Quest reward)
 * I infrequently perish. - Ignores shields. (Quest reward)
 * Yeah, booze'll do that to ya... - Burst fire sniper rifle with slow moving rounds
 * Mainstream'd! - Pitchfork: effects unknown.
 * A Rose by another name: Annoying voice at every reload and critical hit (Quest reward, "Hyperion Contract #873"), Storing gun also does annoying voice, voice comes at random intervals.
 * Man Killer: - Skorry Lyuda - Horizontally Burst Fire and increased critical hit damage

Rocket Launchers

 * Hippity Hoppity!: When reloaded the gun bounces along the ground in a forward-random direction similar to a rubberized grenade. (Tediore "Bonus Bunny" found off spiderant)
 * Name Dropper: When fired, the rocket simulates a small Nuclear blast (Weapon named "gaa dunk ga Nukem"- Duke Nukem reference)
 * The horde will always return! - uses 2 ammo per shot. Fires a large rocket which in turn fires off smaller rockets as it travels. In the description, states 'consumes less ammo per shot. Just kidding! no it doesn't.'
 * Toasty!: Unkown effect, assuming chance to put targets on fire. (Name: "Big Roaster", Quest: "Note for Self-Person")

SMGs

 * in Spain, stays mainly on the plain, Bain: Slows movement, produces annoying Psycho Midget noises when switching to it or firing.
 * When I'm good, I'm very good,Miss Moxxi's Bad Touch: Effect Unknown
 * ...but when I'm bad, I'm better,Miss Moxxi's Good Touch: When held the controller vibrates, does highly increased critical and Fire Damage
 * The gun of the Bulls: (The Lascaux, always found in Frostburn Canyon) - 9-round burst fire while scoped; always has a Double mod and +100% recoil reduction.
 * Riastrad!, (Clan Wars Reward) - Gun Name: Feculent Chulainn. Fires rounds that has procs both shock and slag, player is slagged when equipped.
 * I have a Soldier, a Siren, two Scooters and a Claptrap. (Unknown)
 * Who's a widdle gunny wunny!!! Tediore Baby Maker. Gun explodes like a small mirv grenade when thrown.

Shields

 * Chung-gunk! When a "Law" type revolver is equipped, any melee damage done is converted to health. Also deals roid damage when shields are depleted. (Quest Reward)
 * From the ashes she will rise, Flame of the Firehawk: Constant fire nova effect while shields are at 0. This effect lasts indefinitely, as long as your shield remains at 0, triggers roughly every two seconds. (Quest reward, "Cult Following; The Enkindling")
 * If thumping you is wrong, I don't want to be right, Love Thumper: High roid damage. Low recharge rate and very high recharge delay. (Quest Reward, "Best mother's day ever!")
 * If you can't beat 'em, join 'em: Has voice and personality. (Quest Reward, "Out of Body Experience")
 * What do you mean... theoretically?, Deadly Bloom: Has very fast recharge rate/delay with a very powerful nova on shieldloss or entering fight for your life mode. (Quest Reward, "Helping Out Overlook")
 * The Second is Better, Aequitas: +10% duration to Fight For Your Life for every Aequitas or Veritas equipped in the party. (Quest Reward, "Clan Wars: Wakey Wakey")
 * Wow, I CAN do this all day! - "The Sham" Abnormally high bullet absorb rate. (80% was the one I got.)
 * Win by a hare: Very high capacity, lowers health and movement speed when active, raises movement speed when depleted.
 * for an impenetrable shield, stand inside yourself. neogenetor (Appears to be drop from quest mob during Monster mash part 3) - Has health regen and very high +max life. Lower your shields are the higher the health regen. Stops regeneration when shields are empty.

Grenade Mods

 * 2x more awesome, bonus extreme!: Spawns a second set of child grenades after the first set explodes. Drop from Boom and Bewm
 * It takes two to get one in trouble., Kiss of Death: Homing elemental grenade that latches onto target's face until they die or grenade banishes. Upon exploding sends out healing beams as if from a transfusion grenade (Quest Reward)
 * Make it rain!: Causes grenades to spawn from the one thrown rapidly while it travels through the air. (Quest Reward, "Vlad would be proud")
 * Supplies!, Torgue Nasty Surprise: Teleports and splits into four child grenades near the feet of multiple enemies in front of the player.
 * The thunder shall bring forth the pain!: Rolling Thunder: When thrown stays low to ground and has a explosive bounce. Can not hit high rised enemy and wont jump over small gaps between land. (wilhelm can drop it)
 * Spread the sickness: Corrosive Spawns three homing grenades after initial explosion.

Relics

 * Who the hell shot me?, Deputy's Badge: Increases shotgun damage and reload speed, Increases Fight for Your Life Time by 10% for every player equipped with a Deputy's Badge (Quest reward, "Showdown")