I could go on for hours about this one kid, but I'm going to try and keep it short.
Let's call him C, for his sake. He's loving selfish, obnoxious, and self-important. Often times, when I attempt to ask him a question regarding Spanish (conjugation, etc.), he'll refuse to answer, giving me a wry smile and telling me that I need to do some stupid stuff in order to get an answer, which ends up being a joke that's been beaten to the point of being akin to something unrecognizable rather than what I really need.
Other times, when I call him out on his bullstuff, he'll get incredibly offended and pissed off despite the fact that he knows he did it. Every single comment that could be taken as a double entendre regarding his behavior is like a sleeper agent's trigger word: he'll give you a look, and ignore you completely, even though he caused the loving problem in the first place. One day, I did such a thing and he got offended, as usual. It descended into an argument, and as we left class to go home, he pulled out a math book, and loving hit me with it.
HE loving HIT ME WITH A TEN POUND BOOK.
He hit me on the arm, and I flipped him off and got the forget away from him just in case he decided to wanted blood or something. The next morning, I had a monstrous bruise on my left arm. My parents noticed, and I told them I had fallen. They bought it, but reluctantly. When I got to school, I confronted him and we argued again, as he called me a 'pusillanimous individual for getting a bruise,' and that he hadn't hit me that hard.
YOU loving HIT ME WITH A BOOK.
I threatened to tell administration if he ever did something again. That was around 5 months ago, and I'm forced to associate with him because every class I have with him, he sits right next to me.