A few weeks back, Her Nibs got her mitts on my computer and irreparably popped the letter X off my keyboard. Fortunately, X isn't all that commonly used (fourth from the bottom behind Z, J, and Q). It's annoying, but I can adapt.
Yesterday, the little cherub picked off the letter D. Depending on which list you use, the letter D is either the 10th or 12th most-commonly-used letter in English vocabulary. I am not a happy woman. First, it's annoying to have my finger striking the springy plastic normally hiding beneath the key. Second, my keystroke isn't always noticed by the computer, so I have to keep going back to fix errors.
I guess I should be happy that she only popped the keys off; she didn't eat them.