There is a famous prank that George Clooney and Brad Pitt pulled on the Ocean's movies producer Jerry Weintraub. They challenged him to a vodka-drinking contest, but actually took shots of water. When he passed out, they filled his underwear with M&Ms. On a flight, Cameron Diaz and Leslie Mann did a much friendlier version to a sleeping Kate Upton, their co-star in The Other Woman. Not to give too much away, but at one point they all had mustaches. It was fun and no candy was wasted.