It doesn't even need that really, just wrap it in tissue paper or put a sticker on the screen - enough of a reminder that if you use it you'll be kicked out. (B

It doesn't even need that really, just wrap it in tissue paper or put a sticker on the screen - enough of a reminder that if you use it you'll be kicked out. (But allows you to keep it on you, and to go to look at something before remembering.