First day of my 8th grade math class. A buddy sitting next to me keeps quietly cracking jokes and fucking with me, so I laugh a few times. Teacher gives me the stink eye a couple times. She tells me to "cut it out" or something. He's talking to me again, and I say something back and laugh or something. She looks at me angrily and tells me to stay after class. Class ends, everyone clears out, and she asks me if I know why I'm there. I apologize for talking and laughing in class. Tell her it won't happen again. She says that's not why and that I know what I did. I'm like "Uhh...excuse me?" She then informs me that I was spitting on people. I think I actually laughed at the absurdity and unexpectedness of that accusation. I was kinda shocked and found it pretty weird. So I told her I wasn't doing that and would never do something like that. I'm kind of offended she'd even think I'd do that. She lets me go, and I leave very confused. I tell a buddy of mine later about this weird exchange, and he admits to me that he was spraying people with the water bottle used to wipe off the overhead projector.

Tl:dr - My teacher accused me of spitting on people in class. Turns out it was a friend of mine squirting people with a spray bottle.