In Borderlands 2, Nasty Surprise is obtained randomly from any suitable loot source but has an increased chance to drop from Vermivorous The Invincible. In Borderlands: The Pre-Sequel, it is obtained randomly from any suitable loot source.
Special Weapon Effects
Supplies! – Greatly reduced damage and blast radius. Always longbow. Drops a child grenade above each enemy up to a maximum of four.
Usage & Description
The Nasty Surprise is used much like any other common Longbow grenade. It will drop child grenades on top of enemies, up to a maximum of four. If there are less than four enemies, or none, the grenades not used will drop consecutively on the destination of the initial grenade, working like a Longbow MIRV grenade but deploying all the child grenades in a very small area.
This means that the Nasty Surprise can be used for crowd control (hitting five different targets, one from the original Longbow and four more from the child grenades regardless of its position) or for single enemies, because the 5 total grenades will explode simultaneously on a very small area.
Beyond this characteristic deployment mechanism, the Nasty Surprise has nothing more worth mentioning, as it is inferior to most legendary, Seraph, and even common grenade mods in terms of raw damage.
The name and red text closely reference the movie UHF. In a scene from the film, the character "Kuni" is hiding in a closet marked "Supplies". When the antagonist's goons open the door, he yells "Supplies!", shortly before he and his friends attack the goons. The remark is a double entendre, showing both a literal surprise of finding Asian men in martial arts uniforms springing from a closet, and also playing on the supposition that people with thick Japanese accents often transpose "L" and "R" sounds in words.
The Nasty Surprise is also the only Grenade Mod by Hyperion which is not a Singularity grenade, which is the primary grenade mod type that the manufacturer makes.