Bedazzled clothing of any sort
Show up in an Affliction shirt or anything Ed Hardy and you can show yourself to the door.

Arrogance
You just bought a house? You got a full scholarship running track? Your roommate knew who? You were in what fraternity? Your job pays how much? All interesting, just not all at once....give it a rest.

Snobbery
Please don't be rude to the waiter/cashier/cab driver/person in front of us in line. This does not demonstrate that you are classy and used to people waiting on you, but rather that you're not used to this and are trying to show off...poorly.

Huge Sunglasses
White sunglasses, or sunglasses of any kind while in-doors: You are not Kanye West or an Olsen Twin. Sorry.

Tribal Tattoos
Especially if you are not a professional football player. They scream "spring break mistake."