TIFU by making my brother damage his anal cavity

When I was 18, my family and I were going on a trip to Cancun. I was a bit of a prankster and liked to mess with my siblings, especially my younger brother (15 y/o). So when we got to the airport, I convinced my brother that he was going to get arrested for bringing his dab pen through security. I told him the only way he was going to be ok is if he threw it out or if he put it up his ass. Now, I was planning on telling him it was a prank, but he looked so concerned that I had to continue the joke, but it went too far. At one point, I lost him and realized that he went to the bathroom and shoved his dab pen into his asshole. I ran into the bathroom and pounded on the stall door and told him it was a prank, apparently starling him while he was mid-insertion. He shattered the glass of the dab pen and cut open his asshole. Instead of going to Cancun, we went to the hospital and I ended up being grounded even though I was in college.

TL;DR: Younger brothers are gullible idiots