I wouldn't call it practical, but its something.
One day, while I was in the fourth grade, our school hand an assembly where we watched an episode of "The Magic School Bus" I can't remember what episode it was, but I did remember that is was boring as hell. That's when I decided, halfway through the show, to show everyone how bored I was.
So, I got up out of my chair, walked up to the TV, cut it off and left, pissing off everyone in the room. Of course they suspended me for a day, and my parents had to talk to the principal afterwards...but it was definitely worth it just to make the entire student body angry.
Long story short, I trolled a roomful of people and...