Exploding sheep


 * Cannon Fodder (Sensible Software]) - on later missions, sheep are booby-trapped with explosives.
 * Revenge of the Mutant Camels (Jeff Minter) - one stage features sheep that gratuitously explode into harmful pieces of wool.
 * Worms series (Team 17) - the exploding sheep has always been a weapon, and has since been joined by variants such as the Super Sheep.