In one scene, McAdams and Tatum get down to their skivvies and go skinny dipping in a frigid lake. The scene was filmed at night during the late autumn in Toronto, so everyone was expecting it to be cold and miserable. But when the stars took the plunge beneath the stars, they found the water to be delightful. The "bathwater" was so nice, they didn't want to get out. They even watched the sun come up. McAdams couldn't believe their luck: "It's never like that when you have to do a water scene. It's normally like torture and you say 'I'm never making another movie ever again.'"
Five Film Facts: 'The Vow'
"The Vow" promises to wow incurable romantics this weekend.