That is a pretty long list! Which kind of movies?
We just watched the new Muppet Movie, and it was pretty hilarious--but even more hilarious watching SmallDaughter enjoy it!
We are also Big Hayao Miyazaki fans at our house, so we also love:
My Neighbor Totoro (1994 Fox version, if possible)
Castle in the Sky
Howl's Moving Castle
(if you haven't seen any Miyazaki movies, we recommend watching them in this order. Totoro is one of the greatest kids movies of all time, the other two are for more grown up kids.)
We also love:
Much Ado about Nothing (a bit of non-sexual nudity in the opening credits)
Some Like it Hot
The Scarlet Pimpernel
What's Up Doc?
I love classic romances--I like them more if they are funny, too!
While You Were Sleeping
Return to Me
Somewhere in Time
Pride & Prejudice (most versions!)
Miss Pettigrew Lives For a Day
There are also movies that every adolescent (15 and up, I would say) boy should see, even though they are rather violent, because they are about honor and manhood:
Kingdom of Heaven
Henry the Fifth (1989 Kenneth Branagh version)
So, there you have it: Once again, I CANNOT pick just one!