Have you forgot that your jaw has weight and you must hold it manually as well?
Also, your body is itching in at least one place.
And The Final Countdown is now playing in your head.
You seating position suddenly feels awkward. You can not find good seating position. You suddenly have a huge urge to install deus ex. You don't feel relaxed at all.
You close your eyes. You hear small sound of tinnitus. It's getting stronger and stronger. Dammit. You start thinking about chickens. You feel more relaxed. You are sitting calmly on your nest. You smile a little. There is comfortable silence. You feel like a chicken. You feel some urge feeling stronger and stronger. You push. You push some more. The urge goes away and you have a nice warm feeling. You just laid an egg.