Paddy was in a shop and he said to the shopkeeper "whats that" pointing to a thermos flask.
The shopkeeper said its a flask, it keeps hot things hot and cold things cold. How does that work then said Paddy, shopkeeper says I dont know it just does does. Ill have one says Paddy.
Next day at work Paddys mate says to paddy whats that so paddy tels him its a flask, it keeps hot things hot and cold things cold,how does it work he asks and Paddy replies I dont know it just does What have you got in it Paddy he asks and Paddy replies " a cup of tea and an ice-cream"