wrote:

1. You attempt to change lanes on the freeway by strafing left.

3. You keep trying to pick things up by walking over them...

4. You eat the blue and green balls off the christmas tree

5. You feel lousy and look down for the status bar

6. You grab your kid's backpack and can't believe its empty!?

7. Your desk at work is piled with paper because you refuse to
get too close to the recycle barrel9

8. The only way your wife can get your attention is to throw tomatoes at you.

9. Your PC boots straight into DOOM unless you press a key.

13. You try to double click on every door in the house.

14. You use the alarm clock to tell you when to GO to bed.

These are the classic ones!
Nr.9 is my favorite!