The title.
Guy A: "What's your favourite movie?"
Guy B: "Coming 2 America."
Guy A: "Great movie. But did you see the sequel?"
Guy B: "Yes, obviously."
Guy A: "How is that obvious?"
Guy B: "Because I just told you."
Guy A: "No you didn't. All I heard you say was that your favourite movie was 'Coming to America."
Guy B: "Yes, that's what I said".
Guy A: "But how does that mean you saw the sequel?"
Guy B: "Because I just told you Coming 2 America was my favourite movie."
Guy A: "I'm talking about the sequel, not the original."
Guy B: "So am I."
Guy A: "Then why are you saying 'Coming to America' is your favourite movie?"
Guy B: "Because that's what it's called.
Guy A then jumps off of a bridge.