1) Try to just walk into my office. It's weird. The light is on, there are no study lounges on my floor, but every once in a while, they start just pulling on my door and trying to get in. The door is always locked because I use the main door to the office suite, not the door in my office that empties to the hallway. My door isn't really marked except for a number, but... I guess I mostly get creeped out at what they might be doing in there if they found the door open.
2) Talk loudly on their cell phones about @#$% that doesn't matter. Which, yeah, no kidding... But, Leaguers, I work in a library. You understood how a library worked when you were in school, no? Apparently, that particular people skill went away with the invention of the iPhone with its goofy cable microphone dealy-o. Which they all hold to their faces and shout at the mouthpiece. Also, that makes you look stupid. Which is just slightly better than wearing the blue-ttoth earpiece and looking like a maniac walking down the street yammering to yourself.
3) Make liberal use of the public bathrooms. I was a little confused when informed we had an employees bathroom tucked away around the corner. But more than once, I've entered the public bathroom to find people bathing in the sink/ using the bathroom as if it were in their apartment.
4) Not press the button at the crosswalk so that when the light changes, the indicator says "walk" and you get the right of way. I don't think this should be a part of primary education, along with "how do you exit a bus", but how does one reach college age and make it into the top 10% of their class and not understand how buttons or cross walks work?
5) For some reason, Asian female students always travel in pairs. Always. Just an observation. But somehow these pairs don't hit the button at the crosswalk between the two of them, either.
6) Not seem to know how to order a cup of coffee. The menu is up there, where its been the ten minutes we've been standing in line, sir.
7) Dress up the first week of school in all their new clothes they got for Christmas, and then its back to sweats.
8) Get the hell out of your way when you step off the elevator with any conviction.
9) Either they don't check the weather before they leave, or they take seasonally inappropriate dress as some sign of machismo. Even if its 32 degrees outside, there's always some dudes running around in nothing but shorts and t-shirts. It kind of makes it seem that given ample evidence, these young minds still cannot make an appropriate decision and makes you believe they really DO need their mother to dress them.
10) Stand around talking, loitering in odd places, having lengthy, important conversations, using $0.25 words they just learned in class having the sorts of discussions that, once they're actually working for a living, that they will never have again. That's actually fine. Someone's gotta do it.
special bonus item for Valentine's Day: I see a LOT of dudes walking a half-step behind some young lady, talking entirely too much, sort of following around a co-ed (often who are out of their league) who seems like she's only half-listening. These poor dudes seem to believe that as long as their mouths keep running, the girl may not like them, but she can't get away. And maybe, just maybe, they'll wear her down. And they will find love... *sigh...*