Coffee throwing scene.
When Showalter throws the coffee on Wain. That was so damn funny! He gets so worked up over whole milk vs. 2%. It is funny when he slaps him because he barely touches him but they put in a "slapping" sounds. Showalter kicking him in the butt at the end was just the icing on the cake!
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"If you put your mind to it, you can accomplish anything." -George McFly