Well, my friends and I were sitting together at the table we usually sit at during lunch. Here comes the fat kid, Ryan, who is hated by most of the people in the school. For some reason he chooses to sit by us. This wasn't that bad, but the next part is. One of my friends bought the other a brownie, and was handing it to him when suddenly snatch! Ryan stole it. I then went to get it back from Ryan, who moved his arm away so I couldn't reach. I then pushed him off of his seat, in hopes he would lose his grip of it. He didn't, and just got back up. Another one of my friends decided to throw a piece of wet tomato at Ryan. He then threw it at me, even though I didn't throw it at him. On reflex, I punched him in the face, but not too hard. I punched him again, harder, because he was laughing. I then went to wash the tomato off of my face, and when I got back he had left, and given the brownie to my friend. I haven't got in trouble for it so far. I don't think he'll tell on me, though, since he would get in trouble for throwing the food. My school really cracks down on that.
tl;dr: I punched a fat kid twice in the face.