Sometimes i'm having disorietation or something like that. Like i'm taking off my hand from the mouse and hitting the glass accidentally, but i'm watching a mouvie or something at the same moment. Sometimes i'm going and a guy comes just into me, so i got a little confused which side to take, to let him pass or something like that. And sometimes i can't feel my keyboard buttons like they are here. But keyboard because of it's moving same as my chair i think.