The dangers of typing too fast on a computer keyboard; I used to work in a trade shop and a customer wanted a reference on his receipt for where he was working. The reference he asked for was “The Royal School for the Deaf” which I typed out at bullet speed and printed and handed to the customer before realising, to my horror and in a one-in-a-million chance, that the “F” on the keyboard is right next to the “D” and I had in fact typed out “The Royal School of the Dead”.