bent cam shaft

Never seen or even heard of a bent camshaft. Broken.....yes....but bent? if it's in the cam bearings, how do you bend it?

Enough said! Thanks for the info. I'm thinking the front u-joint is going out and is vibrating at the tranny. I pushed up and down on the driveshaft and I am getting a knocking sound [slop in the bearings] The u-joint was installed in 07 before I bought the car and could have a little abuse on it.