I think mine is still Black Cat, White Cat (https://easterneuropeanmovies.com/comedy/black-cat-white-cat).

From the Romanian movies present there, I liked Aferim - https://easterneuropeanmovies.com/comedy/aferim - but only because it's a sobering look at our history; for non-romanians, it might not be so good. Filantropica (https://www.imdb.com/title/tt0314067/) is also a great movie that illustrates well the post-revolution atmosphere in the country (and it's more likely to be universally-enjoyed than Aferim), but they don't have it on this site.