Birat was looking at a thermos in a store when the sales girl walked upto him and asked, 'May I help you with anything, sir?'
'Yes! What is that?'
'Why, that's a thermos!'
'What does it do?'
'It keeps things hot and it keeps things cold!'
'I'll take it,' said Santa.
The next day Birat went to work carrying this thermos. His co-workers asked him what he was carrying.
'It's a thermos.'
'What does it do?'
'It keeps things hot and it keeps things cold!'
'So what have you got in it?'
'An icecream and a cup of coffee.'