1. Seems mighty chummy with the dog all of a sudden.
2. Unexplained calls to F. Lee Bailey's 900 number on your bill.
3. You find a stash of "Feline of Fortune" magazines behind the couch.
4. You wake up to find a bird's head in your bed.
5. As the wind blows over the grassy knoll in downtown Dallas, you get a faint whiff of catnip.
6. Has taken a sudden interest in the wood chipper.
7. Ball of yarn playfully tied into a hangman's noose.