>Hrm... I wonder if this feature might be helpful to some friends of mine -- they have a cat (named Fuzzy) that seems to go missing for a few days sometimes. The cat's behavior has always left me confused -- I'm not sure if I'll ever understand Fuzzy logic..

For a cat this is quite normal. The cat simply has not learned that one can not disappear.

See: The Cat How Walk Through Walls, Heinlein, Robert A.