No ding ding ding = bad thing thing thing

One of the tires on my car was low today so we took it to the local gas station for a little air fill-up. I'm used to the little air pumps that ding when your pressure is too high, so Mrs. Dave and I were understandably surprised when the thing went >>POW<< right in front of me. There's really little more embarrassing than having to change a tire at a gas station when you've originally pulled in to FILL said tire.