UK and 9/11 Warning Time Difference

Listen, dumbo, here's the deal. You're probably the kinda guy who thinks milk comes from the grocery store. The joke is based on a misunderstanding of how time zones and international relations work. The punchline implies that because the UK is ahead in time, they should have foreseen and warned the US about the 9/11 attacks. It's funny because it's a ridiculous expectation, and plays on the idea of time as a straightforward predictor of events.