Carlisle police said a man exposed himself to a female employee at the drive-thru window of a Dunkin' Donuts early Monday.
The employee told officers that she heard a knock at the window at around 5 a.m., and opened the window to find a man with his pants to the ground performing a lewd act, police said.
The unknown man quickly left the area.
He was described as a white male in his 30's, about 6'0" tall with an average build, and shirtless.
Anyone with information may call Carlisle police at 717-243-5252.