BoingBoing:

OverType simulates, to an undesirable degree of accuracy, the experience of using a mechanical typewriter. You can have three fonts, one of which is IBM’s classic Courier, set the degree to which you want your typewriter to be broken, and the state of your ribbon ink. You cannot delete—but there is correction paper!

This will make the older readers smile and the younger readers say, “How did you put up with this!?”