I was opening a box with a utility knife and I got a huge cut. I got the cut from the cardboard after i sliced the tape. It was nice and bloody. It stopped stinging after a few seconds, but I still have the bandaid on. The bad part about using good bandaids is that they stay on too long and then I leave them on too long. The cheap ones always fall off and then I dont look all bandaidy all the time.