A couple is on a plane in the middle of the night, and it is dark and quiet.
The woman says to her husband: "let's have sex right here".
The hudband says: "You are crazy. people will hear and see us".
"But everybody is asleep", claims the wife, "I will prove it to you. I will ask for water and you'll see that nobody answers me and nobody even hears what i'm saying".
So the woman says in a low voice: "Can I have some water please?". But noone answers. So the husband starts having sex with her.
After the plane lands, a man runs to the steward and says: "quick, give me water. I have been so thirsty for the last 5 hours".
The steward gives him water and asks him: "why didn't you ask for water during the fligh?".
so the guy says: "No way, a woman two rows in front of me asked for water and you won't believe what they did to her!".