I'm looking for the movies with the best twist (surprise ending), know any?

I like movies that have a good twist at the end. So I would like to know a few that are really good so I could have a few good movie nights!

I really enjoyed “The Game”.

If you name some I have seen that is fine, because I would like to make a top 10 or even top 20 list.
What is your top 5 or top 10 favorite movies with a “twist”?

If you can only think of one, that is perfectly fine :)