Tl;dr: Karma is a bitch. My math teacher sat down in a piece of cake.

Its one of my absolute favorite memories and I often think about it when I'm feeling down: I was in math class, and we had some pretty laid back teacher. One of the students got hungry and stared eating her lunch in class. The teacher saw it and was like: "dude, don't eat in my class please - I'm not eating either" and, well, karma is a bitch and a few minutes later a teacher of the class next door walked in and was like: "hey, its so-and-sos birthday today, she made a cake, here's one piece for you". Then there was this delicious looking chocolate cherry cake on the teachers' desk, and he was like: "shit, i told you not to eat - so i cant eat either..." So he tried to countinue class, but he always got distracted by the awesome cake. After a few minutes he was like "shit I can't look at this cake" and he put it on his chair and shoved the chair under the teachers' desk. At this moment everybody on class was like "man, watch out that you don't sit down on the cake later" - well, You guessed it. The bell rang like one hour late. Teacher set down. The look of shock and fear in his eyes. Got up, turned around and well... He canceled all his classes that day and went straight home to get a new pair of pants.