A bathtub with water in it is a death trap in a cat's mind.  But it's pretty funny when you see one slip in there.

If your a complete idiot then you wouldn't know that cats hate water. Like really hate water! Almost as much as Mr. Rogers hates Mr. T! Put them in a tub combined with water and they can't get out! I'm not saying go and do it, but you happen to put some cat nip in the middle of the tub with a little water in it, you might get a funny experience.

You can see the fear of god in these cat's eyes!