Judging by my colleagues and I waste hours discussing in the office on Friday afternoons, the following should yield lots of stupid arguments and happy reminiscing:
Top Five Bond movies - usually descends into a vitriolic debate on who is the best Bond, the best Bond Girl, the best Bond villain etc. (Perhaps a rather British obsession?)
Top Five caper movies - For me, the original The Italian Job and The Sting are definitely in there
Top Five MacGuffins e.g. The Maltese Falcon and The Big Sleep
Top Five War movies - Patton, Lawrence of Arabia, Catch 22, Apocalypse Now, The Quiet American.
(For cynical Brits, you get a sub-category - Top Five Movies Where America rewrites History and Saves the World e.g. U-571.)
Anyways, I hope that helps, and I really like the show!
Bina.