What’s the most inconvenient place you’ve gotten a boner?

School bus and in school as class was over. Used my book bag as cover on the bus and sometimes books in class. I think once or twice I had to lift it up under my shirt hoping my waistband would hold up so I didn't flop out.
I used to get boners on the school bus all the time, had to put my legs up on the seat in front of me to hide it. I even stealth fapped a couple times.
 
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