I haven't actually had one, but I'm actually planing one. so, my fourth grade teacher became a 6th grade teacher when I was in 6th grade. I didn't have him as a teacher but my teacher would invite other 6th grade teachers in her classroom for lunch. one day I come in and my chair is tipped over. I just think that someone was being careless and knocked it over so I put it back up. just about everyday this would happen. one day, as I had came back from recess I saw the 6th grade teachers leaving the classroom. my 4th grade teacher comes up to me and says "I think your chair is broken" and I say "yeah, I don't know what's wrong with it but it keeps on falling over after recess". as he leaves I can see my teacher and another teacher in the background laughing, my teacher then comes up to me and says "sweetie, he's been tipping over your chair". now I will finally get to the revenge part.
what I plan to do is to go into his classroom when he's not around. then I will tip over every single chair in the classroom. and then on each chair, I will have printed out pictures of Pigeons taped on to them, so he knows it's from me. then, I will tape a note on his personal chair reminding him about what he did to my chair and add a smiley face.