Leaper

Leapers are an enemy introduced in the Zombies map Fortune's End. They appear to be regular "Dead Risian" Zombies, albeit lying on the floor, slumped against a wall etc. When a player approaches them, they will occasionly jump up in an attempt to grab and kill them. Going into Bathrooms will make as many as three jump out of the stalls and follow the player. If their attempt fails, but they don't die they will lie down as if nothing happened. Leapers are arguably one of the most annoying things of the 900bv Boss Battle.

Trivia

 * Leapers are the only way that Fortune's End connects with Off the Record, as Leapers are exclusive to it, and not the original Dead Rising 2.