Because they can bleed for a week and not die.
Some Stormtrooper
They both died on Thanksgiving
A: You skip across the flat ones.
Shaven, not furred
A : It had a bleed on its tail fin.
because you can't trust something that bleeds for days and doesn't die.
A: When you lay a brick it doesn't follow you around for two weeks whining.
A: It was supposed to be in place last week!
