Here's one that no one has mentioed and a MUST see.
It's A Mad, Mad, Mad, Mad World
Some of the greatest comedians ever, on top of there game well written, well directed and still stands the test of time. Look at the line up.
Spencer Tracy, Sid Caesar, Milton Berle, Buddy Hackett, Ethel Merman, Jimmy Durante, Mickey Rooney, Jonathan Winters, Phil Silvers, Dick Shawn, Terry-Thomas, Edie Adams, Dorothy Provine, Jim Backus, William Demarest, Peter Falk, Paul Ford, Leo Gorcey, Edward Everett Horton, Buster Keaton, Joe E. Brown, Carl Reiner, The Three Stooges, Jack Benny, Jerry Lewis and more.
Impossible to find that much talent today and if you could you could never afford it.