Not only of game design. People never read things that they don't expect or want to read. Message boxes are wonderful in this regard. Users trained themselves to dismiss those without ever reading them. Usually Cancel or No will close the message box and destroy nothing. Heck, I frequently even see people getting annoyed at message boxes that have a little □ Don't show this message again checkbox without ever noticing that they could get rid of them forever. Simply because they won't read.