So its time for another top 5 list! This week I've noticed a couple things I feel are social faux pas, some in the classroom, some outside.
1. Eating your lunch in class. I am taking maymester classes, which last about 2 1/2 to 3 hours, so I totally understand getting hungry during class, I myself usually bring a small snack to eat during the breaks the teachers usually give. However, bring a spread of cheese, pitas/crackers, and apples which you spread out over your desk, slice and eat during class is inappropriate! Its rude, unsanitary, and you could eat before class.
2. People who make rude remarks about others in class. I'm not talking about gossip here, I mean those people who sit and talk about how wrong/stupid someone or their opinion is. If you disagree, or think the person is flat out wrong, say something! Contribute to the class discussion, don't just sit there and grumble.

3. Thoughtlessly exposing others to your second-hand smoke. I am a non-smoker, so I know I'm biased, but I feel like exposing others to your cigarette is really rude. I was at a drug-store with a drive-thru recently, and a woman pulled up to the window with her freshly lit cigarette. The woman just sat at the window blowing smoke into the poor pharmacist's face and into the drugstore. Can't you wait to light up until after you drive off?
4. Letting your phone go off at an inappropriate time. You know when you are going to be in a situation where your phone shouldn't go off. Just turn it on silent to begin with!
5. Regifting. If it is something you don't want that someone else will actually use and it is almost new, then go ahead! BUT when it is a gift card that is obviously years old or something that has been opened before, just suck it up and buy a real gift. Unless you just want to piss the receiver off.
photo from SuperFantastic at flickr