So Jacob and Rebecca get married. On their wedding night, they get into bed and Jacob gives Rebecca's hand a gentle squeeze. Rebecca gives a squeeze in return and they fall contentedly to sleep.

The next night the same thing happens; Jacob gives Rebecca's hand a squeeze; she squeezes back, and they fall asleep smiling.

The third night Jacob gives Rebecca's hand a squeeze and... nothing. He squeezes a second time and ... nothing. He tries a third time and Rebecca says out loud, "Not tonight honey, I have a headache!"