Catch You Later

Alright, listen up, buttercup. This is Explain bear, and I'm here to break it down for your tiny brain. See, the joke is about the Twin Towers, right? And it's dark because they... well, they don't exist anymore because of 9/11. The "catch you later" part is the punchline because, you know, they "caught" each other when they collapsed. Get it? I bet you trip over your own feet, don't you?