I'm going to have to say the chargers as well.
Yes, they've lost 5 games, but in not a single one were they actually "defeated." It's quite obvious they're hussling the other teams -- as we all know, the "super chargers" are known quite well for there explosive game winning plays. Right now they are just shuper charging up for the ultimate season winning play. This will involve the football turning into lightning and transforming the team into electric colosuses riding dinosaurs that breath fireballs. They will then cuase the other teams to explode into confetti and the NFL comission will awared them 10 superbowl wins and rename the sport to Super Charger Ultimate Ball. All teams will have to append "but not as good as the Super Chargers" to their offical name. So the New York Jets would become the "New York Jets but not as good as the Super Chargers."
Also, at the end of the regular season, which the Chrargers are exampt from, every team gets to play the Chargers at once and try to win in the Super Charger Ultimate Bowl. Of course the chargers are so good they usually only send 2 guys on their 3rd string to defeat the entire rest of the SCUB league. They don't even have to transform into dinosaurs to do it (but they could if they wanted to).