Connecting rods can happen from hydrolock of the piston because of a petcock not turned off. Doesn't really happen all the time but when it does I think we hear about it because the rider is so perplexed. We hear about one of these every year it seems.
There may be no symptoms of a bent connecting rod until the owner does a compression check and discovers low compression on one side. It really has to be checked for before the engine comes apart because you may not see it until you look for it. The check is to look for TDC at the same time on both sides.
Connecting rods can also be twisted.
I straightened mine by hand when assembling the engine.