I never even thought about this!It makes me wonder what the actors had to endure, being told you've got a job in film is good but then being told you'll spend 95% of the time with your mouth strapped to some guys butt (who's probably eaten a lot of beans and cheese early on in the day) - I'd rather clean up road kill on the busiest street in the world for a living thanks.
Seriously though does it make you wonder if they had to go on special diets so fellow actors wouldn't suffer!