Q: What can bite, but has no teeth?
First off let me say, that question was interpreted wrong. Or maybe read wrong. I really dont remember for sure, but this is what Kevin and I heard. The real question was "What has teeth, but can't bite?". The answer is "A Comb".
Kevin's PG answer was:
"It's gotta be a butthole. Cause it can bite a terd in half". (<-----Insert hysterical laughter here)