I saw this for the first time in a classroom in 1975 in first grade and a handful of times on the old "Night Flight" on the USA channel. It's a film short to show good manners - not only in the lunch room, but in the classroom, the lunch line and the bathroom as well.
It is one of those riot-us films that make you laugh as it teaches you to wash your hands before eating as this kid uses a gallon of soap to do so....and to comb your hair before you go to lunch - as these boys whip out their pocket combs for what has to be 2 mm of hair. All while this Disney-type narration rolls in the background "Joe would never cut in line. That's something a Mr. Bungle would do". "Mary covers her mouth when she sneezes." "Ricky is running in the lunchroom. 'Do we run in the lunchroom?' Mrs. Smith asks. No. That's something a Mr. Bungle would do."
To offer one last description: It is a propaganda film for manners with a real live, antiquated 'Goofus and Gallant' (of Highlights for Children) portrayal. It is ridiculous - and I wish I owned it.
The only place you'll find it now is on the original 1981 "Pee Wee's Playhouse" HBO Special - they show some of it there. Make sure you look for the kid to grab dessert.
Pee Wee Herman has the best line after showing the film on the aforementioned HBO special. "Big enough piece of cake or what?!?!"
Indeed. Thumbs Up.