"A Guide To Man-Machine Interface" joke

USER-FRIENDLY
C: DUR
Command not found. Try retyping

USER-HELPFUL
C: DUR
I don't understand DUR. Do you mean DIR?

USER-UNFRIENDLY
C: DUR
C: DUR
C: DUR
C: DUR

USER-HOSTILE
C: DUR
Ha! A mistake! I'm sure you meant to say FORMAT, so that's what I'll do.

USER-INDIFFERENT
C: DUR
DUR?

USER-PATRONIZING
C: DUR
Now, that's not quite right is it? Let's try again; this time, use the manual that the nice salesperson gave you when you bought me.

USER-OBSEQUIOUS
C: DUR
I'm so very, very sorry but I don't understand that. I'm sure it was my fault, but if you would please try again I'll do my best.

USER-SARCASTIC
C: DUR
Well, Look who's made a mistake then. Very unusual, I don't think.

USER-INSULTING
C: DUR
F*ck off
C: DIR
F*ck off

USER-SMUG
C: DUR
No
C: DOR
Nope
C: HELP
No
C: PLEASE
Not unless you give me a 300Mb hard disk to live on.
C: B*ST*RD
Abuse will get you nowhere

USER-ANALYTICAL
C: DUR
What makes you say that?
C: A TYPING MISTAKE
How long have you been making these mistakes?
C: BANANAS
Do you like bananas?
C: I LOVE THEM
Why do you bring up the subject of love?
... etc

USER-McDONALD
May I help you please?
C: DUR
I'm sorry but that command is not available at this time. Have a nice day.
C: DIR
Will that be an MS-DOS directory?
C: YES
To read here, or for printout to take away?
C: HERE
Thank you. Have a nice day.

USER-MEGALOMANIAC
C: DUR
Don't bother me with trivial requests. I'm busy.