A similar issue was shown when Adobe Flash fullscreen was first introduced (I think it was just Macromedia at the time, but anyway). When you went to fullscree

A similar issue was shown when Adobe Flash fullscreen was first introduced (I think it was just Macromedia at the time, but anyway). When you went to fullscreen in flash, it printed a giant "you are now in fullscreen mode" in the middle of the screen, but somebody showed that simply by printing similar text all over your screen, it hid that warning very well.