My kids are still a little young and/or so far too docile for any show stoppers, but I will share my mother's finest parenting meltdown, involving my brother, who was 17 at the time (he is 35 now) -
DB was driving home from a friend's house at about 1am. My father had a really cute convertible Alfa Romeo Graduate that DB was driving. On a long downhill slope in a neighboring town, he decided to open 'er up (road deserted and long and smooth). As he zoomed by a side street, a dozing police car pulled out and put on the lights to pull him over. DB thinks, I will just cut to side streets and drive around like crazy until I lose him.
Needless to say, he did not lose the cop, who called for back up and finally there were three cars chasing DB when he finally pulled over. The cops, having no idea what type of badness the driver was involved in that made him evade three police cars driving like crazy person in the middle of the night, order him out of the car and onto the ground on his stomach with the bull horn, and then approach with THREE SHOTGUNS drawn. They hog tie him and bundle him to the police station, at which point my parents get the 3am call -
Mr. X, we have your son at the Busytown police station. He's been placed under arrest for speeding, reckless driving, evading the police and resisting arrest. Would you like to come and arrange bail?
They went to get him. My father handles everything, and my mother does not speak the whole time they are in the station. Legend has it she is alternating purple and white. They get to the car, my DB in the back seat and my parents in the front. Before my father can even drive out of the lot, my mother (4'11'' and 90 pounds at the time) lunges over the seat of the car like a tasmanian devil, shrieking and whacking at my brother, and proceeds to "batter" him the whole way home. DB is 6'4'' and over 200 pounds. The way the story is told, this whole scene is like a flea attacking an elephant. DB is trying not to laugh, which enrages my mother further. She finally collapses with exhaustion. When they get home, DB and my father go in the house, and my mother just stays in the car for the rest of the night, seething.
Afterwards, the incident is never spoken of by my mother until at least ten years later, when she can finally look back and laugh. To this day, if my mother gets irritated with DB, he will say "mom, you're not going to start whacking me on the arm again, are you?"
After two very well behaved girls, it's a miracle that my mother survived my brother.