Usually my class tortures the subs. Once back in eighth grade, we were in publications class (which has different grades for different periods). Anyway, she asked us which grade we were in and a boy named Jake blurted out sixth grade and we all agreed. It's a good thing, too, because sixth grade had a free-day and we would've had a pop-quiz!
Here's another one. Back in sixth grade, we had an older sub with very red hair. Anyway, we noticed that whenever she bent down, there was a huge gray spot on top of her head!! So everytime she did so, we'd just start laughing our heads off and none of us bothered to tell her! lol
Here's the best one yet! Last semester, during the last period of the day (it was a block-day, meaning the class was about two hours long), we had a sub that never showed up. Apparently what happened is that the sub had gone home early because she was sick and had forgotten to get a replacement. So anyway, when we all sat there for a while with no sub, we all decided "Screw school, we're going home!" lol And we did, too!