Why Can't I Stop Laughing?

This afternoon I was listening to Science Friday on NPR, which was featuring its annual April Fools' Day jokes show.  A good number of the jokes were amusing enough to make me smile, but I keep thinking about this one and laugh out loud each time I remember it:

Schrödinger is driving with Heisenberg in a car when Heisenberg says, "I think we just ran over a cat."

"Is it dead?" asks Schrödinger.

Heisenberg replies: "I can't be certain."

Why does that make me LOL so much? Even as I typed it, I had to stifle a chuckle.

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