Funny as hell
The part when the female pidgeon drops Fievel off and says "Goodbye my little immigrant" Just her accent...kills me every time.
And when Warren T. Rat takes Fievel to the sweat shop and the big ass mouse grabs Fievel and Fievel screams his head off. I know it's harsh but the fact that he screams like a girl it's too damn funny.
And finally when thier on the ship to America and some dude who is walking by steps on the hot coal and goes "AHHHHHHH!" Jokes!