I recently saw some gameplay where a rabbit runs into the water flee from its attacker. I thought it looked funny. Mainly because you don't see it in other games. About a minute later there is an elk wading in the water, i could not tell if the current was pushing further down stream or if that was the direction that it was going. I guess since that kind of thing hasnt been seen in other games too much it looked funny.

I think this is relevant:
http://www.youtube.com/watch?v=HpD40ewOyC4