Heath Ledger turned up, did that, and now every comic book villain is just trying to keep up.
Fun fact: "Heath Ledger locked himself in a hotel room for six weeks to develop the Joker's voice and mannerisms."
Every December the same argument about whether it's a Christmas film kicks off, and it never gets old.
Fun fact: Frank Sinatra, then 73, was contractually required to be offered the lead role first.