On paper, pairing The Notebook's Rachel McAdams with Dear John's Channing Tatum was a match made in weepy movie heaven. In reality, their electric chemistry was better than fans expected. VIDEO - Channing's Prosthetic Prank on Rachel But what went into making The Vow's leading lovers so magical? That's one of the aspects dissected in a featurette on the DVD and ETOnline has an exclusive sneak peek at the interviews. Watch!