Vincent left to go help in the Crusades and decided that his wife Vicky should wear a chastity belt (steel underwear). So he locks her up and gives the key to his best friend, Robert, who lives in the neighborhood.
He tells him, "I hope to be back in two years time, if I'm not back in four years, unlock my wife and set her free to live a normal life."
So, Vincent leaves and drives off towards the airport to catch his flight ... about half an hour later, he checks another speeding vehicle right behind him seriously flashing lights. At first he was hesitant to stop but later stopped.
Robert jumps out and runs to Vincent's car.
"What's wrong?" Vincent asks.
Robert replies. "You gave me the wrong key!"