There were two cows in a field. One said, “Moo.” The other one said, “I was going to say that.”

Not stupid enough?

How does a train eat? It goes chew-chew,

Knock knock.
Who’s there?
Britney Spears.
Britney Spears who?
Knock knock.
Who’s there?
Oops, I did it again.

If growing up in the ’80s taught me one thing, it’s that my friends and I should have found a treasure map by now. (@LizHackett)

That actually constituted half an hour of Googling just now.