“The Princess and the Pea”
A story by Hans Christian Andersen. A prince insists on marrying a real princess. When a woman comes to his door maintaining that she is a real princess, the prince's mother tests her by burying a pea under a huge stack of mattresses and then ordering the woman to sleep on the mattresses. The woman cannot sleep and therefore passes the test: being a true princess, she is so delicate that the pea keeps her awake.