The 'was ist das?' Interesting Movie Challenge

A list with no concept beyond being deeply beloved at 'was ist das?' (what is it?). This not the greatest or the weirdest or the most obscure or anything like that. This is just if you came round for beer and burritos, this is the kind of thing we'd try to introduce you to but maybe you've seen them already? We find them interesting and are interested to know if you know them too.