Must see movies

Time for a bit of culture and much needed light relief on the blogs.

Whilst pottering round some charity shops I came across 1001 Movies You Must See Before You Die. I have no idea how good it is, but for £1.99 I decided it might widen my viewing as I am trying to catch up on both recent and older films I have missed.
1001 is a little daunting though and this is where the readers of the blog can help out.

What 10 films would you be your 'must see before you die'?

Oh and don't try to be all arty and clever and just list obscure unwatchable pretentious films , lets have what you really like.