http://www.2flashgames.com/f/f-1146.htm
No, not "Whack a Bunny 2", but "Wack a Bunny 2". Although you are whacking the bunny.
I found this game the other day courtesy of a tool on my sidebar (gosh, I love Vista). Anyways, it's very addictive, and very stress relieving, although if you're triggered by the sight of blood, I would suggest playing something else, because once you get to the third level it starts to get really violent.