harvestmen are the real clowns of the animal kingdom. they look terrifying, but are terrible at climbing. there's one in my home right now. I've seen it fail to climb glass and laquered wood. it seemed to do fine climbing on wallpaper for a while, but fell down a few minutes ago. it looks like a stripy river-pebble with snake-teeth, and that's probably the least scary type.
ITS ARMS ARE CENTIPEDES!
THE KAYANS RULE THE POST-APOCALYPSE!
this one strikes the balance between pretty and scary; I may steal it for a boss.