CONFIRMED :man falls in excrement in this film?

Hello,

on the 'I need to know' board I was asking for the title of a certain Yugoslav film. This is the link :

http://www.imdb.com/board/bd0000001/flat/49497645?d=49498008#49498008

A member told me it could be this movie.

This is the essence of what I wrote there :

I think in the end there was a scene with a lot of people (family?). It could have been a wedding. I also remember it was close to the water, and some people were using small boats.
The only thing that I still vividly remember is that one young man -could be the principal character - decided to settle some sort of feud with another man present at the party : he sabotaged the toilet (it was a rather primitive looking toilet) so the other man fell through when he used it. When he emerged, rather angry, he was covered in excrement (I guess he fell right in the septic tank/pit) and that was supposed to be hilarious I guess, lots of people at the party found this very amusing. I think the young man who did this was seeing the consequences of his actions, and was enjoying himself. It is possible the dirty man was shouting things at him while the young man was going away on a (small) boat.

So what do you think, is it this film?
Thanks,