The worst thing of the root canal for me was that they had a hard time getting the numbing agent where it needed to go, so they used a lot, so half my face was numb for the rest of the day. So I looked really weird when eating/drinking/speaking/smiling.
I read someone else musing that they must have thought that keeping it plugged in all the time would be bad, so the made it impossible to use the mouse while plugged in. Seems plausible. I suppose it would degrade the battery? Or the cord drag would be bad?