A man died and went to heaven.

As he stood in front of Yamaraj at the Yamalok, he saw a huge wall of clocks
behind him.

He asked, 'What are all those clocks?'

Yamaraj answered, 'Those are Lie-Clocks. Everyone on Earth has a Lie-Clock.
Every time you lie the hands on your clock move.'

Oh,' said the man, 'whose clock is that?'

'That's Siddartha Gautam. The hands have never moved, indicating that he never
told a lie.'

'Incredible,' said the man. 'And whose clock is that one?'

Yamaraj responded, 'That's BP's clock.

The hands have moved twice, telling us that BP told only two lies in his entire
life.'

'Where's Prachanda's clock?' asked the man.

 

'Prachanda's clock is in God's office. He's using it as a ceiling fan.'

(from Biyalo.com)