A psychiatrist can diagnose their patient by asking the user to press any key.

What they press indicates which mental afflication they are suffering from:

• space bar - penile size complex.
• ctrl - control freak
• esc - escapism
• alt - schizophrenia
• shift - split personality
• enter - vaginal fixation
• F1 - overgrown ambition.
• num enter - anal fixation
• num zero - low self esteem
• menu key - bulimic
• tab - drunkard
• backslash - paranoia
• caps lock - Tourette's
• delete - destructive
• arrow up - mania
• arrow down - depression
• windows key - suicidal tendencies
• reset - hopeless idiot.