Futurama
S5E10: The Farnsworth Parabox
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why did our Leela look into the box and your Leela didn't?
Well, to be honest, I tossed a coin.
It came up tails, so I didn't look.
That's weird. Mine came up heads, so I did.
Interesting. Apparently, the key difference between our universes...
is that coin flips have opposite outcomes.