When I was in school there was a girl in my class, who would masturbate ALL the time in class. She seemed to think no one noticed but several kids (including me) saw her do it on a daily basis. When people started to tease her about it she denied it but kept right on doing it every day. Eventually a rumor started that she started taking hot dogs from the lunch room to use as a dildo and eventually broke one off inside, requiring a trip to the nurses office. Not sure I believed that one though.
I actually hated it at the time because she would give a boner in class from watching her... Ah, the dreaded classroom boner.
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