Insert punchline

Since I saw this sign I've been trying to come up with the perfect joke about Schrödinger's cat, but with so many options, I've not been able to settle on any.

For what it's worth, I'm not laughing at the misfortune of those who have lost the cat.  But the uncertainty about the whereabouts of a cat with that name, which is why it amuses me, is almost too good to be true.