Identify film where eating and toilet taboos are reversed

Question

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 embarassed, 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.

Answer 1

Le fantôme de la liberté (The Phantom of Liberty)

Luis Buñuel, 1974

One of Luis Bunuel's most free-form and purely Surrealist films, consisting of a series of only vaguely related episodes - most famously, the dinner party scene where people sit on lavatories round a dinner table on, occasionally retiring to a little room to eat.

http://www.imdb.com/title/tt0071487/plotsummary

The scene you are looking for is available at Youtube