I study martial arts at a nearby dojo. A couple of weeks ago I was hanging out with my buddies waiting for the girls class to end. The class was for women's self defense. During every class, this 40+ year old guy stands in the doorway watching his girls. We all think that he thinks that he is the man. Well he happened to be wearing sweatpants that day and one of my friends dared me to jerk his pants down to his ankles and like a ninja, do a front roll to the front desk jump over it then do another roll out the door and then run to safety while my friends caught it on camera. Well, while the guy stood there with his arms folded across his chest, I gathered all of my courage and dove after his trousers. I shucked them to the ground - almost pulled them clean off and wiped the sweat from my brow with them. I did my rolls and dashed out the door. I stopped at the corner only to hear my friends yelling at me to keep running as they were sprinting toward me. When we finally stopped, they told me the stupid guy was not wearing underwear. On my friend's phone you could see there was a 3 second delay from the time his waistband touched the ground until he realized why several females started screaming. That's when my friends took off. We figured the cops were called so none of us has been back. There are security cameras everywhere and we all are known well there. I guess I will just let the last 8 months of my membership run out. None of us know if the guy got in trouble for flashing the class. I'm afraid I have ruined his reputation. I'm not sure how to resolve the situation. I bet his daughters hate his guts for embarrassing them. I feels so bad - even though I can't stop laughing. What should I do?