Box Car Blues is a 1930 animated short film from the Looney Tunes series. It is a very inventive short.
Yes, its biggest strength is its crazy and very entertaining inventiveness in action. It follows Bosko and his pig companion as they are in a box car travelling as hobos, but their boxcar gets separated on a hill and they head down rapidly. The separation sequence is just amazing. The train is going up a hill and becomes alive in order to reach the top. It also pulls the pants down from the mountain which is also alive in a crazy, fun fashion. That moment is easily the most memorable Looney Tunes moment thus far.
Unfortunately, the second half is nowhere near as fun or as authentic as the first one, but it does manage to have a great ending which really closed the cartoon in a great manner. I just wish that the pig character was more memorable and that is something that has been bothering me with this series thus far – the supporting characters are kind of forgettable, but I am sure that will get fixed eventually.
Box Car Blues does feature a weaker second half, but the first one is amazing and filled with a couple of very inventive moments.