The joy of..........cutting both your thumbs at the same time

You may find this one difficult to believe. I was at a trade show this week and was demonstrating a kitchen gadget called the 4 in 1 grater. The graters are acid etched steel and incredibly sharp. I knew this. I was demo-ing it to a customer & before I knew it I'd pushed the blade the wrong way & cut my thumb, bleeding thus began. The product is mainly white the demo station was white, you can imagine the rest, anyway, trying to laugh that off and continue talking at the same time I did it again to the other thumb!
Luckily the customer had a couple of plasters & no, they didn't buy it! I now have to have a note from my wife, counter signed by my boss to allow me to go near anything sharp or pointy.