Since I'm bored, I wrote down this.
You'll probably meet him at class. He comes in two version: one looks like the Niels Bohr pic you can find at the end of this topic. He's the intuitive subtype. The other one looks like a dreamier, more abstract-oriented, possibly smarter but less attentive to his apperance version of you. Logical subtype. Duchovny pic.
Let's first talk about the N. You and him probably agree on everything in principle. He'll argue with you just for fun. Making up points that are absolutely unrealistic. He doesn't really belive in them though, so no problem. He'll think that you take arguments way too seriusly, you'll think that he just doesn't get done anything in life. Both of you will know that it's better not to press Fi points. If there are feeling types in the nearbies, you can be useful to both of you by repelling every emotionally-related question with a Se attack. He can also be pretty sociable, but too passive and friendly for your own taste.
Bottom line: this guy is of no use for you, except for wasting time arguing and telling him how to get girls.
Now the L subtype. He's really useful in the classroom. He can give in-depth explanation that are easy for you to understand. You'll think that his life revolves around giving those speeches: not far from the truth. He can make a good friend of yours but you won't keep up with his abstract crap, and he won't keep up with your phyisical one. Debates with him can go on for hours, but they're fun. Supposing an equal level of intelligence, both of you are going to have similar levels of wit.
Bottom line: listen to his explanations, assimilate and incorporate the info into your system, and move on with life. Maybe a debate or two for fun, but keep in mind that winning is hard.
Both of them aren't dangerous at all, but they're not particularly funny either, so it's up to you to decide whether to befriend them. Likely end: you'll forget about him as soon as he gets out of sight.