Two men Lory and Dwart

Two men Lory and Dwart are chatting as they work.

Lory says: "I've been attending night classes for 5 months now and I have an exam next week."

Dwart: "Ooh!"

Lory: "For example, do you know who is Graham Bell?"

Dwart: "No."

Lory: "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.

Dwart: "Do you know who Alexander Dumas is?"

Lory: "No."

Dwart: "He's the author of 'The 3 Musketeers'! If you take night courses, you would know this."

The next day, once again:

Lory: "And do you know who Jean Jacques Rousseau is?"

Dwart: "No"

Lory: "He's the author of 'Confessions', if you take night courses, you would know this."

This time, Narayan got irritated and said: "And you, do you know who is Balakrishnan Kuppuswamy?"

Dwart: "No"

Lory: "He's the guy roaming with your wife! If you stop night courses, you would know!"