Special Weapon Effects (Borderlands 2)

Pistols

 * De Da.,Law: Unknown. (Quest Reward, "Won't get fooled again")
 * Havin' a tea Partay drinkin' mah Teeea!,Teapot: High corrosive effect (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 : Unkown effect (Quest Reward, "Clan Wars: Wakey Wakey") 
 * Good at starting fires, Unknown
 * Thinking outside the box, Unknown

Shotguns

 * Because one barrel aint enough and two is too few, Thre Dog: Three barreled shotgun named
 * 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..., Moxxi's Heartbreaker: Fire damage and +50% critical damage. (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.

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 (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, 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... - Rapid fire sniper rifle with slow moving rounds
 * Mainstream'd! - Pitchfork: effects unknown.
 * A Rose by another name: Annoying voice at every reload (Quest reward, "Hyperion Contract #873")
 * Bison Bison had had had had had bison bison bison shi shi shi... Quest reward for Demon. Sniper rifle with no scope, hi damage and 5X critical 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: When held the controller vibrates, does highly increased critical damage.
 * ...but when I'm bad, I'm better,Miss Moxxi's Good Touch: Effect Unknown, 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.

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 riot 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")

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. (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.

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")