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Grandpa: Now, remember the plan, boy. If you run out of air, tug on the rope…
Bart: 64 times, no more, no less. Got it.
Grandpa: No no! 63 times if you’re out of air; 64 is if you found the treasure!
{later}
Grandpa: 61… 62… 63… Oh no! 63! He’s out of air! I’ve sent my only grandson to a watery gra… 64! He’s found the treasure! I’m rich!

-from The Simpsons 1996 episode “The Curse of the Flying Hellfish”

Remember that one? (I wish I could find a video to embed. Some help, please?)