a modern Chinese slimming cure
Jane: Dad, how many gallons of water do you think are in the air of a ten by ten by ten foot room?
Dad: Hmm, maybe a couple kilograms.
Jane: So a dehumidifier that could only suck out a pint every few hours would probably reduce the relative humidity by only say, two percent?
Dad: Why do you want a dehumidifier? Is your face getting too fat?