<human>: Little background: my high school marching band was heading into the city for a Thanksgiving parade, and staying there overnight.

So my whole marching band was heading into the city, requiring 5 buses.  All the buses left at the same time, and in the incredible traffic that is Chicago, my bus and another one pulled up next to each other.  Unbeknownst to me, the band director was in the bus directly next to mine.  Anyway, when you two buses full of high schoolers next to each other, it is essentially inevitable that people will flip each other off.  Some of the people in the other bus (i.e. ex-girlfriend, friends) flipped me off.  I responded in kind, as most people would.  I was not the only one on either bus by any means, either.  Unfortunately for myself, at the exact moment of my flipping off, our bus moved forward exactly enough for me to be flipping off my band director.  He quite obviously thought my gesture was directed at him.  We pull away, and I didn't see his reaction but apparently it was pretty bad.  He gave a speech to that bus on how this was exactly the kind of behavior that would get you sent home.  That night at our band dinner he came over to my table, and put his hands on my shoulders and in the most passive-aggressive sort of way, said, "How you doing, bud?"  It was one of those: "you're in such deep shit right now" moments.  He didn't talk to or look at me the rest of the night or the following morning, especially surprising because I'm one of his favorite students.  Anyway, I'll post another update on Monday when I'll probably know more.  Wish me luck.

Can you give me a shortened version of the text?
<bot>: Flipped my band director off when two buses pulled up next to each other.  Hasn't spoken to me since.