Meg Ryan having an orgasm in a diner, in When Harry Met Sally. After which another patron tells the waitress "I'll have what she's having".
Or Steve Martin playing a dimwit (in Dirty Rotten Scoundrels) who asks, in the presence of a female dinner guest, "May I go to the bathroom". Michael Caine gives his consent, and the Steve Martin character sits there staring into space with a glazed look in his eyes.
"Animal House" scene with the late John Belushi stuffing his cheeks with mashed potatoes in the school cafeteria after announcing "see if you can guess what I am now" after Babs says "that boy is a P-I-G, pig".
He pops his cheeks, mashed potatoes go everywhere and he proudly says...."a zit, get it?" A huge food fight ensues!
I didn't start out as a meal scene but the fight Mark and Daniel in Bridget Jones' Diary where they start in the street and wind there way through a restaurant breaking up the place disturbing the meals and a birthday song all the while the music score was "It's raining men." I was priceless.
Oh my god, there's one scene in Monty Python's The Meaning of Life where Eric Idle's in a nice restaurant at the piano playing a song about it being awfully nice to have a pen*s. Then this freaking huge man comes in to have his dinner, hurls and orders everything in the menu. He eats so much and hurls throughout and John Cleese keeps feeding him until the last little bit makes him explode. Aaaaaaaaggghhhh!
It's not my favorite but it's so disgustingly memorable.
The scene in Rocky Horror after eddie(meat loaf) is killed, they are having dinner at the table when someone mentions Eddie and Tim Curry says "Yes, Eddie, thats a rather tender subject right now" and everyone realizes they are eating eddie.
Anne of Greene Gables/ She has discovered a mouse in the pudding because she forgot to put the top cloth on it.She dishes the mouse out and is planning to tell ,but she just can't confess to Marilla. Then just as a guest is about to eat the pudding Anne screams and tells the truth. Cracks me up...
A lot of scenes kill me in a movie, so I'm going to be telling mine as the thread grows. But here's one - the part in the movie, No Country For Old Men, were the villain walks into home of the lady who just buried her...