I had one where I dated some girl I know that I'm in no way attracted to and then she went weird and blanked me. The funny part (to me) was at one point a teacher told me that in order to do the spreadsheet work for the class (she was an English teacher, confusingly enough), I would have to download Microsoft wrekcel. In the dream I totally failed to acknowledge it, but found it weirdly hilarious once I woke up.
I've also had one where I decided to run away from a lesson at school, like sanic. In running away I got caught by some year 7s and their teacher doing some form of fieldwork, and ended up getting taken back to school. I became bezzie m8s with one of these year 7s, and then it was time for my detention. This was held in what I can only describe as a cheap knock-off of the forbidden forest from Harry Potter. There was a pond thing (in the context of the dream everybody called it a lake, but it was smol), and next to it was a pile of green stuff, like a pile of hay but I think it was dank kush or something. Apparently my detention was to swim through the pond, but before that a cameo appearance was made by a northern, shaved Dumbledore. We had a conversation like the following:
Dumbledore: Come on m8 this'll be easy
Me: m8 that lake is poisoned and has acid in it and I've gotta swim underwater
Dumbedore: Oh yeah that's a bit of a deal innit
At that point he wandered off and then I woke up ultimately confused. I've never forgiven Dumbledore for being such a useless sack of ****, though.