Reportedly telling a police officer it was a “stupid thing to do,’’ a Rhode Island man now faces criminal charges after a tour bus full of passengers said they saw him masturbating in his truck on Route 146 in Sutton.

Robert H. Donnelly, 53, of Smithfield, was arraigned Friday in Uxbridge District Court and charged with lewd, wanton and lascivious conduct and disorderly conduct, the Worcester Telegram and Gazette reports.

Police said they quickly spotted Donnelly’s truck and pulled him over, noting the driver straightened from a reclining position while being pulled over by police.

Gross as the allegations are, they could be weirder: Last September, a flight from Boston to Los Angeles was diverted in Omaha, Nebraska after a passenger allegedly began masturbating and pulling on the emergency exit during a mid-flight nervous breakdown.