C'mon, those are all lightweights.
I suggest a one-two-three punch of
Nekromantik (Jörg Buttgereit's classic romcom: a love triangle between a man, a woman, and a corpse - bring a date!)
Diên Biên Phu (the French go to the battlefield in Indochina - they fight, they die, they go home; next day they're on it again - it's like the Groundhog Day of bleak war movies!)
and
The Promise (gritty/quirky social-realism drama by the Dardenne Bros - they're like Belgium's Farrelly Bros!)
(BTW: Songs is an amazing masterpiece and also very, very funny - see it.)