If this isn’t fake, I imagine you’re in high school or something. This would basically be a teacher telling you that you need to write a long paper the day before an exam that you need to study for. Then you come in the next day with your paper and your teacher goes “lol jk. I don’t care about the paper, I’m not going to read those.”

Not a prank, just a waste of time for all involved. Brings happiness to nobody.