A spectator at a New Jersey half marathon created his own finish line Sunday — dropping his pants and pleasuring himself in front of roughly 200 runners, according to witnesses.

“He was standing on a corner in flannel pajamas with his shirt open and touching himself,” a bystander told the Pascack Valley Daily Voice. “Then he just dropped his pants.”

The marathon masturbator was arrested about a third of the way through the annual 13.1 mile Reservoir Run in Emerson.

He was later taken to Bergen County Regional Medical Center for a psych evaluation.