One day, a blonde and a brunette are sitting together for lunch.

The brunette sets a thermos on the table, and the blonde asks what it is.

'It's a thermos,' says the brunette. 'It keeps hot things hot and cold things cold.'

The blonde stares in awe as the brunette pours steaming hot coffee out to show her. The next day, the blonde is showing off her 'new' thermos to another blonde.

'See this?' she asks.

'What is it?' the other blonde asks.

'It's a thermos, and it keeps hot things hot, and cold things cold!'

'Oh, what do you have in it?' the new blonde asks.

'Two cups of coffee and an ice block.'

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