Crack!
I was at a friend’s birthday party in middle school one year. The parents tools us to dinner at Hooters and afterwards we were killing some time running around playing tag in the parking lot. At one point, I’m tagged it, and proceed to chase after the birthday boy.
In the process, I accidentally got a little excited and pushed him in my attempt to tag him. I broke the kids arm. On his birthday. He missed out on the first 3 hours of the sleep over due to being stuck at the ER. His dad had us all go upstairs and play Halo to kill time.
Needless to say, I was not very popular at that sleep over… Story credit: Reddit / ForrestFireDW