Something tripped off this memory from high school. I took an Algebra II class my sophomore year and the teacher was an old lady with a strong Southern accent. She said "maished" instead of "mashed", when describing potatoes. Also she spoke my name as "Bayuth" instead of the monosyllabic "Beth". Her class was not fun because she did not have a sense of humor. She would work problems each day on an overhead projector, and was really uptight about keeping the overhead film clean. The clear film was kept on a roll instead of by individual sheets. So, one day she was out of the room for a long period of time, and I took a marker and placed the tip down on the overhead film, then rolled the film out until there was a single line from start to finish. This cracked me and several other students up.

When she returned, she was not happy. Nobody ratted me out, though. This still makes me chuckle.