Cakatoo the Rooster

Alright, listen up, buttercup. This is a knock-knock joke, see? The punchline is a play on words, like when your mom tries to be cool but just ends up embarrassing you. The joke sets up "Cakatoo," which sounds like "cockatoo," a type of bird. Then, the punchline is "So you're a rooster now?" because a rooster is another type of bird... get it? It's funny because the person is implying the other person is a bird, which isn't an insult but... yeah, it isn't great. You probably don't get out much so that's why it's so difficult.