During work, Tom and Harry were chatting:

Tom: Harry, I’ve been attending night classes for 5 months now and I have an exam next week.
Harry: oh!

Tom: For example, do you know who is Graham Bell?
Harry:No
Tom: He’s the inventor of the phone in 1876; if you take night Courses you would know this.

The next day, the same discussion took place:

Tom: Do you know who Alexander Dumas is?
Harry: No
Tom:He’s the author of “The 3 Musketeers”, if you take night courses, you would know this.

The next day, once again:

Tom:And do you know who Jean Jacques Rousseau is?
Harry: No
Tom: He’s the author of “Confessions”, if you take night courses, you would know this.

This time, Harry got irritated and said: And you, do you know who is Jack scott?
Tom:No
Harry: He’s the guy roaming with your wife!! If you stop night courses, you would know.