What did the mama cow say to the baby cow?
Mooooooo my secret is that it's pasture bedtime, but not pasture bedtime!
Listen up, buttercup! This joke is udderly simple. It's a play on words. "Pasture" sounds like "past your," get it? The mama cow is saying it's past the baby's bedtime, but she is making a cow pun at the same time. Bet you feel stupid, and you are!