Three young friends die in a car accident and go to heaven. They're shocked to discover the ground is covered with ducks. A voice from above says, "There is only one rule in heaven: you must never ever step on a duck." In no time, one of them accidentally steps on a duck. Immediately, St. Peter walks up with the ugliest girl he's ever seen. "As punishment, you must now remain handcuffed to this woman" and he handcuffs the two of them together.
Seeing this, the other two begin tiptoeing around, being very careful, but again, one of them accidentally steps on a duck. Once again, St. Peter comes up and handcuffs him to another very ugly girl.
The last friend is determined not to step on a duck. Day by day, he's very careful to look around before he moves an inch. After days, weeks, and months, St. Peter walks up with the most attractive, curvaceous, blonde girl he's ever seen, and says, "Thank you for not stepping on any ducks" and handcuffs him to the girl. He can't believe his good fortune and says, "Wow, I have no idea what I did to deserve getting handcuffed to you, sweetheart!"
The girl replies, "I don't know about you, but I stepped on a duck."