The Holy Grail was much funnier than The Meaning of Life.
You must have It's a Mad Mad Mad Mad World if your talking classics.
10 - Bo Derek and the little english guy
and by the original comedy duo, The Music Box, (L & H Deliver a piano) and Big Business (L & H sell christmas trees door to door and end up destroying a house while the homeowner destroys their car.)
Big Business has an additional unwritten joke. Hal Roach Studio claimed that they would use the home of a studio employee with the express purpose of wrecking it for the movie.
The employee would also be awarded a vacation with his family while the picture's filming was in progress. Supplied with a house key and a photograph of the dwelling, the studio technicians located it (or thought they did), trying vainly to open the front door with the said key.
The director, James Horne ordered, "Break the door down! We're going to tear the place apart anyway." After a few days filming, things were running smoothly, until a man and wife came driving up the road with two kids in the car. The woman fainted and the man started yelling at the film crew, causing the studio people to realize that they had destroyed the wrong house!
Our Grandparents laughed at L & H and they're still funny 80 or 90 years on...