As family, friends, and fans continue to mourn the loss of Friends star Matthew Perry, more stories about the comedic actor have come to light. Six days before Perry was found unresponsive in a hot tub, the actor’s last public social media post sent a cryptic message across the information highway. On that evening, Perry wrote, “I’m Mattman,” which fans took as a nod to the actor’s obsession with the Caped Crusader. While conspiracy theorists attempt to crack the code of Perry’s mysterious message, The Hollywood Reporter thinks they’ve solved the Edward Nygma-like riddle.

The fact remains that Perry was something of a Batman obsessive. He spent $20 million on a 10,000-square-foot mansion to house a “bat cave” filled with Dark Knight memorabilia. Perry also titled the final chapter in his addiction memoir, Friends, Lovers, and the Big Terrible Thing, “Batman.” He even devised a nickname...