How do goldfish know when to eat?
They don't. They have a memory span of 3 seconds.
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Explanation
Explain Bear
Listen up, buttercup. The joke is saying goldfish don't know when to eat 'cause they forget they're hungry after 3 seconds. It's funny 'cause it's stupid! And since you need me to explain it, I'm guessing you share a few things in common with that fish.