So I had an idea that's not fully fleshed out but thought it could be pretty funny. It's set in the cafe with Superman, Batman, Iron Man and possibly Spiderman or who ever sitting at a booth chatting about whatever when they over hear a conversation with Lex Luthor, Joker, and whoever who happen to be sitting at the booth behind them talking. Maybe Joker is telling Lex about how he got his scars or Lex is complaining about how he lost his hair and they're both complaining about their hero counterparts. Maybe the Green Goblin is there too. I can see the camera focusing on the Heroes talking, drinking coffee when they hear Joker's laugh or something, stop talking and then the camera pans over to the villains and a conversation/argument ensues. Maybe the Heroes can't believe that they would come into their cafe or something. Anyhoo, I think/hope you get th idea and I'm sure that someone else can fill it in more.