A guy was on duty in the main computer lab on a quiet afternoon he noticed a young woman sitting in front of one of the workstations with her arms crossed across her chest, staring at the screen.

After about 15 minutes he noticed that she was still in the same position, only now she was impatiently tapping her foot.

Finally, he approached her and asked if she needed help. She replied, "It's about time! I pressed the F1 button over twenty minutes ago!"