I work at your average office job and for a long time, my lunch was getting stolen from the fridge, I label my food. I’ve tried leaving notes asking for the food thief to stop, but it hasn’t worked. I tried to ask other coworkers to keep an eye out, but also no one could find them. I even tried to get hr to help, but they shooed me off, so I decided to teach the thief a lesson. The next time I brought food, I packed heavy laxative powder and extremely pure capsaicin(spicy chemical) into the food, when lunch rolled around I heard someone crying saying their mouth hurt and then they ran off to the restroom for the rest of the day. The next day I got called to hr, but after I explained the situation in full, I was let off, my coworker has not lived it down from other coworkers, my intent was to prevent food theft again, but now I think I might have acted too harshly, so AITBA? I should mention that I was fully prepared and willing t eat the food myself as I enjoy spicy food and I have constipation issues. (Edit) I will say that it is about 5 grams of pure capsaicin, which is about my limit, and yes it was a regular dose of laxatives, they are just purely for constipation, which can cause diarrhea if things are working normally. And I should mention that the offender was completely fine the next day.