PDP1 console: 
TYPE ALL MESSAGES INTO THIS TELETYPE AND END THEM WITH A PERIOD.

BBN vp:  Do you think that I can use the computer this morning?

eliza:  Why do you ask?

vp:  I might be able to make some additional Telcom sales.

eliza:  Why aren't you so sure?

vp:  My prospective customers have never seen a demonstration of the system.

eliza:  Does this mean very much to you?

vp:  Of course it does.

eliza:  You seem very positive about that.

vp:  This is ridiculous.

eliza:  What do you mean, this is ridiculous?

vp:  Is there any reason why I can't use the computer now?

eliza:  Tell me more about your prospective customers.

vp:  Please dial me up on 491-1850

Note that after the last remark the VP did not obey instructions, and left out the period. Therefore, of course, the computer didn't answer him. This so infuriated the VP, who thought Bobrow was playing games with him, that he called Bobrow up, woke him from a deep sleep, and said:

vp:  Why are you being so snotty to me?

bobrow:  What do you mean I am being snotty to you?