"Against Regulations" joke

A couple is travelling on a long distance overnight flight. Everyone is slowly drifting off. The flight attendants have served the last round of coffee and drinks, dimmed the cabin lights, and are resting. The couple carefully check over their fellow passengers. Finally, everyone appears to be asleep. One at a time, they furtively make their way to the bathroom at the rear of the cabin. Before closing the door, the last one in has a quick glance back over the cabin to make sure they haven't been spotted. There's rustling of clothes as they prepare themselves and get comfortable:
"Ready, dear?"
"Yes, darling."
"Oh, good! You remembered the condom."
"Quick, let's get it on and get started."
A little more rustling, then:
"Aaahhh!"
"Oohhhh!"
Suddenly, the intercom comes to life:
"This is your Captain speaking."
"To the two people in the toilet - we know exactly what you're up to."
"What you're doing is expressly prohibited by the airline regulations."
"Please stop immediately, put your cigarettes out, and remove the condom from the smoke detector!"