Pandas, What Was The Worst Thing You Accidentally Did As A Kid?

I was about 9 or 10 years old and went "back to school shopping" with my mom at Walmart. By the time we got to the cash register, the shopping cart was so full it was almost overflowing. When it was time to pay, mom handed her credit card. I took a look at it and asked her "Mom? You never told me you changed your name to Celine Barette?" Of course, my mom almost died right there from embarassement, as the cashier and clients all looked at her in disbelief. She somehow was able to convince the cashier that it was just a bad joke and that I would get grounded for it. But that's not all... Finding myself pretty funny, I then put my hand in my jacket's pocket and mimicking a gun, I looked at the cashier and said "Lady, put all your cash in a bag and hand it over. Don't make a scene or I'll shoot". What I did not expect was that the cashier stopped moving and started crying. Suddenly feeling bad, I said "Hey! It was just a joke!" She then told us that her husband, who was a Brink's employee, had been shot and killed in a holdup a few months prior. Finally, mom never had to ground me for all of this. The lesson had been taught and stays with me to this day...