Sardar and the lie detector 

An Englishman, an American and a Sardarji are called upon to test
a lie detector. 

The Englishman says: 

"I think I can empty 20 bottles of beer".
BUZZZZZZ, goes the lie detector.
"Ok", he says, "10 bottles".
And the machine is silent.

The American says: 

"I think I can eat 15 hamburgers". 

BUZZZZZZ,goes the lie detector.
"Allright, 8 hamburgers".
And the machine's silent.

The Sardarji says: 

"I think...",
BUZZZZZZ goes the machine.