Most of my favs have already been mentioned but I
LOVE the ending while the credits are rolling and Mr. Rooney is all tattered and torn and he reluctantly gets on the school bus. The kids look at him like this

and this

then he sits down next to the nerdy girl no one else wants to sit next to

and she offers him some Gummy Bears. She says something to the effect of "They're nice and warm.They've been in my pocket all day." Mr. Rooney takes one and flicks it across the bus. Then, he looks to the kid next to him and see's the
SAVE FERRIS on the notebook. All this with the music going on in the background "Oh Yeahhhh..."
Classic...