As for Jack Nicholson films... Hmm...
The one that sticks in my head is, of course(?), "The Shining". However, I do believe the first film I ever saw him in was "One Flew Over The Cuckoo's Nest". -And we actually watched that film in high school too - at a Catholic High School no less! -I forget which class it was for, but we did watch it.
Recently, I did like him in "The Departed", and because I'm such a sap, I'm looking forward to "The Bucket List".