That Riviera touch - Morecombe and Wise. I saw it when I was first married to my ex. I laughed so much that he had to put his hand over my mouth as people were glaring at us. I even found myself remembering snippets while walking down the street and laughing out loud - very embarrassing when you're on your own.
A year later, I was in the early stages of labour with my eldest but refused to go into hospital until I'd had my lunch. Then I discovered That Riviera Touch was on TV so I said I was watching that first. By the time it was finished, I was having contractions every five minutes and hadn't actually seen much of the film.
I've seen it since as well. Great film. Close second is any of the Pink Panther films with Peter Sellars and the old Ealing studios films such as the Lavender Hill Mob.