We were having a conversation at work today about things you've never done that are quite common. Among the office were never played monopoly, never seen a musical, never been to a festival etc.
The ones I can think of for me are:
I've never watched a 3d film, I've never baked a cake, had fondue, played Dominoes or been to the London Eye, Madame Tussauds or the Tower of London (more of a regional one, but having lived in London and the South East all my life, it makes it more common).
What are yours?