What is the name of the movie in which eating and toilet taboos are reversed [closed]

Can anyone identify a (possibly French) film where the cultural taboos about going to the toilet and eating (not at the same time!) are reversed?

I remember seeing a scene with someone knocking on a door to an eating room, finding that someone was already in there eating their dinner, and being embarrassed, as if it was actually a toilet (restroom). They were quite happy going to the toilet together however.

Does that ring any bells?

This may actually be a TV programme, rather than a film, so I hope that's still acceptable.