Last November, Philadelphia District Attorney Larry Krasner issued a characteristically blunt warning to anyone hatching plans to “play militia,” threaten voters, or otherwise interfere in the upcoming election: “F around and find out.”

“You can have your fun in a jail cell, ’cause that’s what’s coming,” he said in a press conference that went viral on social media. The next day, Krasner downplayed it—“to everyone’s surprise, [I’m] getting a lot of attention”—but displayed a T-shirt that staff members had printed with an acronym: FAFO.

Krasner used to say he’d retire after his tenure as district attorney, but now, he’s not so sure. “I don’t have any plans,” Krasner told me. “But I do get a little irritated when elected officials in higher office open their mouths, and I hear clucking coming out.”