Now that the NFL playoffs are in full swing, fans' emotions are at a crazy fever pitch. If you're lucky enough to get to see one of the playoff games live, have a great time -- but keep your cool. If you don't, you might end up being mocked and laughed at on YouTube for eternity.

As a public service, we have compiled some videos of fans behaving badly to show you what you should not do. Think of it as a primer on how not to watch the playoffs.

Celebrating in the stands when your team does well is one thing, but make sure you don't take it too far. Performing your own personal Gatorade shower is a no-no, especially because you're not the only one who is going to get doused.

Word to the wise -- keep your shirt on! And if anyone ever tells you to "Take it all off," remember that any disjointed striptease you do in public could very easily be made very public.

Going on to the field is never a good idea, even if you're trying to grab a cool souvenir. As you'll see in this clip of a moron grabbing a ball from Brett Favre, it's a safe bet they're not going to let you keep the souvenir anyway.

Nobody likes it when jerks fight at the game, especially when it gets in the way of people doing the wave.

If you're going to go to an opposing team's field and you wear your team's colors, that's cool. However, keep in mind that if you get obnoxious the home crowd might decide to retaliate, as Eagles supporters do here to visiting 49er fans.

Have you ever wondered what's it's really like to play professional football? Well, take it from this clip: You do not want to find out.

Ladies, keep in mind that men are not the only ones who can lose control at the game. But if you do, the same fate awaits you as your belligerent boyfriend, as these too-young women find out.

Finally, if you do happen to find yourself at a game in the company of the police, take our advice and do exactly what they ask you to do. If you don't, things will only get a whole lot worse for you very quickly.