The line comes from Rob Reiner's 1987 fantasy comedy The Princess Bride, adapted from William Goldman's novel. Carol Kane plays Valerie, the excitable wife of Billy Crystal's Miracle Max, and she waves Westley, Inigo Montoya and Fezzik off with the farewell after Max's miracle pill brings Westley back. Fans have quoted the exchange for decades, and the shortened goodbye became a handy soundboard clip because it works without context, as a warm send-off before any risky plan, raid or ill-advised adventure.