Classic films you feel your children must see before growing up?

[Enko]

DH and I have decided to create a movie night with the children (all teens to 21)

Tonight we are going to watch Casablanca or Some like it hot.

What classic films do you feel are " must watch?"

Oh and back to the future

My kids are still very little but our movie choices have included

Wizard of Oz
Charlie and the Chocolate Factory (original)
Chatty Chitty Bang Bang
Mary Poppins
Calamity Jane
Cats
The Princess Bride
Ghostbusters
Grease
Star Wars
Empire Strikes Back
Return of the Jedi

They’re small just now but the list will expand as they get older to include many on this thread. Movie night is a firm favourite in this house.