If they do, it could be because they want to feel more like part of the family, or it's just a particular animal's personality and that animal was matched with the person meant for it.
@AJs:
See, Dan? First you tick everybody off, now you make everybody cry.
But you're still not getting off the hook that easy. You will NOT be banned and in fact will be required to stay. :D
What?! That's it I'm going back to my stupid jokes!
I love this! I'm just going to add one more to my version before using it–next to last item--I can legally spay/neuter them so they don't get (or get anyone) pregnant!!!