The naughtiest thing I did started with an accident. I was in a bunch of plays in high school. In one of them for some reason I got stuck with this stupid costume change where I had to be done in like 10 seconds or something stupid so I had to just slip my pants off to the side of the stage and pull my skirt up and then jump back on stage. I got good at it during the rehearsals, but then during the third performance my panties got caught on something (I swear another performer was holding it, but I can't say for sure) and I got tripped up and fell onto the stage with my panties just above my knees, kneeling on the stage facing away from the audience.
The naughty part was how absurdly turned on it made me. I was operating at base carnal levels here. I don't even know why, but I just bent over and spread my pussy for the audience before getting off the stage. Then of course I fingered myself furiously in the changing room the next scene change.