The Simpsons
S7E22: Raging Abe Simpson and his Grumbling Grandson in: 'The Curse of the Flying Hellfish'
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Now remember the plan, boy.
If you run out of air, tug on the rope--
Sixty-four times. No more, no less. Got it.
No, no! Sixty-three times if you're out of air!
Sixty-four is if you've found the treasure.