Sergei Eisenstein's black and white mute Strike from 1925 - and it is 1,5 hours long!
Mia sat through it all, and like Max said, sometimes laughed at the wrong time - to everyone's amusement. The last 15 minutes or so she got a bit bored just sitting and watching, so we walked a little in the background instead.
How many can say their first move was Soviet avant garde from the 20's? Go Mia!