A keyboard is that thing you're typing at right now. Go ahead. Examine it closely. I'll wait.
One of the bad things about keyboards is that little kids have a tendency to run up and hit all the keys at once. The ensuing nuclear explosion usually destroys the keyboard, and you have to go out and buy a new one. Fortunately, today we have child-proof keyboards. Whenever the goobers come running up, they emit a high-powered laser beam, killing the kid instantly. This can save you a lot of expenses from having to buy new keyboards.