How do goldfish know when to eat?
They don't. They have a memory span of 3 seconds.
Goldfish Memory
Categories
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.