Apart from the usual killer gob3 joint, sadistic lecturers who derive pleasure from watching their students fail, and student leaders who don’t keep their campaign promises when elected, you are bound to see these six types of guys on campus.

Pick a university campus and you’ll be sure to find these guys. Some of them are relatively easy to spot. Others, you’ll have to look at a little more closely to determine which category they fit in, but they can’t fool us.

Here are the good, the bad and the guy your mom forgot to warn you about.