A man goes to get his salary cheque and when he opens it he discovers that his employer has overpaid him by Rs.2000. He decides not to tell anybody and keeps quiet. At the end of the following month when he opens the cheque, he sees that he's been underpaid by Rs.2000. Fuming, he goes to have it out with his employer. 'Sir, I think you've made a mistake on my cheque.' 'And how do you figure that? his employer asks.
'It seems I've been underpaid by Rs.2000.'
'So?'
'No disrespect Sir, but I want my money.'
'Last month I overpaid you by Rs.2000 and you didn't complain so why now? '
'Well Sir, thing is I don't mind if you make a mistake once but if it becomes a habit I have to say something'