I remember this commercial. They even showed the out take on some crappy show I don't remember, all I know is that he did so many takes, and drank so much coke that at one point as he turns to the kid, instead of delivering his line he let this huge belch go...and then smiled with a sense of relief.
I also remember laughing my ass off, but then I was a kid.
This commercial was so big they actually did Mean Joe Green interviews about it. They told him he could spit the Coke out after each take and he thought it wouldn't be a problem because he loved Coke. After way too many takes he had no problem spitting it out.