1. True Lies
2. Austin Powers
3. Witness
4. North By Northwest (when he's shaving himself with the ladies' razor)
5. Robocop

All of these are in the gents too. Are there any great film scenes in the female toilets?

Actually the bit where they focus on the guy's piss stained trousers as he runs out of there might move Robocop up to number 1...