The Simpsons
S5E19: Sweet Seymour Skinner's Baadasssss Song
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Boys and girls, Mrs. Krabappel,
I come before you today to solve a riddle...
that has plagued mankind for centuries.
What has four legs and ticks?
A walking clock?
A walking clock!
I'd wager he has some variety of walking clock in that box.
Bart, is it a walking clock?