Every Ryder Cup, each captain has an extremely awkward assignment: He has to choose the golfer on his team he trusts the least. Enter the “Envelope Rule.”Beginning at the 1979 Ryder Cup, each captain was tasked with putting the name of one player in a sealed envelope to be opened in case of emergency. The theory was this: If somebody on one team got injured during competition, that team shouldn’t be punished. Because you’re choosing a player to sit out singles, you’re picking the guy whose contributions you’re looking forward to the least. But there were back-to-back Ryder Cups where we found out.