creeper

A monster from the game Minecraft. It is one of the most dangerous hostile mobs in the game. Spawns in the Overworld on light level of zero. Its only attack is to explosion, fatally damaging the player, and destroying nearby blocks. This, combined with its nearly silent footsteps and its only making its trademark "Tsss" (or "シュー" as it's known in Japanese) when it is about to explode—has given it a notorious reputation for taking players completely by surprise.