The horned, jumping beast in the original Quake. He scared the living bejeezus out of me, and made my older brother wet himself... Here's a link to a pic..http://www.idsoftware.com/games/quake/quake/images/full02.jpg
EDIT: I CANT MAKE SPOILER TAGS, DAMMIT! SO STOP ASKING!
EDIT: I CANT MAKE SPOILER TAGS, DAMMIT! SO STOP ASKING!