A weasel walks into a bar. The bartender says, "Wow, I've never served a weasel before, what can I get you?" "Pop," goes the weasel.
Pop Goes the Weasel
Explanation
Explain Bear
Listen up, you chucklehead! The joke is that the weasel says "Pop," which is a play on the phrase "Pop Goes the Weasel". It's an old nursery rhyme. You probably don't know it, cause you have rocks in your head.