Apparently, the first rule about tricking the umpire isn't don't talk about tricking the umpire.
According to Blake Richardson and Andy McCullough of the Los Angeles Times, New York Mets third baseman Todd Frazier admitted to the media and Alex Verdugo he switched balls and fooled the umpire into thinking he actually caught the Los Angeles Dodgers outfielder's foul ball in Monday's game.
Richardson and McCullough explained Verdugo fouled a pitch near the crowd, prompting Frazier to dive into the stands. While the ball slipped out of Frazier's glove as he landed, he grabbed a replica ball from the stands and held it up.