He knocked the three knocks. The two rap-raps. He whistled like a wren. Then he knocked twice again. The flight attendant replied, "Captain. Pick up the phone. I'm not playing your games."
"Oh come on. Just reply with the secret knock. It's easy."
"What is it you want?"
"To go to the restroom."
"Ok. Punch in your code and I'll punch in mine, and we'll get you to the lavatory and back."
She punches her code, her hand on the handle. She waits. "Captain?" She hears three knocks. Two rap-raps. A whistle like a wren.
"Captain. I'm a grown woman....