I have two:
The first day a started college, this huge thing developed on the side of my mouth. People said it that it was a fever blister but I knew better. After being humiliated for a day or so, I went into the men’s room. I pushed and prodded it. Blood started pouring from the corner of my lip. I kept going from every angle at least another hundred times until BAM. The entire mirror was covered in pimple gunk and I was pain free. The thing healed a day later.
Last summer, my wife wanted to go to the beach. I put on the sandals in the car and itched so bad that I looked down and there was a blister about the size of a marble between my big toe and the next one. I presume it was due to a due to a spider bite. When we got to the beach, I ran out to find something to puncture it with. I found a rock that was not unlike something the Native Americans used. I sawed back and forth with the rock until the thing ruptured. I swear, close to a teaspoon of liquid drained out. I went swimming that day and it only hurt mildly. The next day I was cured.