A Cat of Schrodinger: When this cat is not being observed in any way it is both dead and alive. When something observe it, it suddenly becomes either dead or alive with a 50% chance of either.
Of course, if you a prepared to wait for some good luck this is a handily resurrect-able cat.
The Pen Of I'm Sure I Had One On Me Somewhere: Functions as an ordinary ink pen. As soon as the owner removes his attention from this pen it will teleport unnoticeably away to a random location.
Tie messages to it for a handy way of spreading messages around randomly!