Thermos? 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.'