Yawning as a pick-up line

That's different.

According to Jennifer Ackerman in her book "Sex, Sleep, Eat, Drink, Dream: A Day in the Life of Your Body," at a party among strangers, you should yawn and see who yawns with you.

She writes that only about 40% of the population — those who score high on self-awareness and empathy —is given to the sort of interpersonal rapport that might result in a consensual yawn.

She notes that it's empathic individuals who are most susceptible, and that a reciprocated yawn will help you identify not only those who may have been surreptitiously watching you but also those you'd hope were doing so, weeding out less tuned-in observers.

Anything's better than "Do you come here often?"

[via The Hook]