I got sent out of my geography class for having a squeaky chair. I kid you not.
Although, that was one of the best lessons ever: Two of my friends who sat on the same desk were separated and moved around the room several times because they wouldn't stop clicking their pens, and they were eventually moved back to where they started. Three students? bags were thrown out of the window, one of them narrowly missing the head teacher. Everybody had an A3 paper airplane. Somebody kept farting throughout the entire lesson. One of the kids left the room when the teacher went to get disciplinary backup, then ran up and down the corridor making ghost noises. Pens were hurled with great quantity in every direction. Somebody spilt their cola all over the floor. People were playing on their GBAs. We all took it in turns to sing various songs. A friend bounced a rubber ball from the window, which is three stories high.
Needless to say, we got no work done at all that lesson. To top it all off, when the teacher left halfway through to get the disciplinary staff he never came back, and they never arrived. I will remember that lesson very fondly.
So I guess you could say it was an epic fail for the teacher as well.