Box Car Blues

Bosko goes hobo and his train ride takes predictably violent detours. This being 1930, the omnipresent reference to Jolson's Mammy makes a showing.

http://www.bcdb.com/cartoon_video/3798-Box_Car_Blues.html

Like most of the early cartoons, this suffers from constant repetition of gags that aren't really that funny. And when you accept the fact that Bosko was never a really interesting character to begin with, you can understand why Leon Schlesinger was desperate to create something like Mickey Mouse at Disney.