An Iowa man was arrested last night for allegedly measuring his penis with a cardboard ruler while at a urinal inside a college library bathroom.

Police collared Thomas Morgan, 42, on a misdemeanor indecent exposure charge in connection with a May 7 incident at the University of Iowa’s Main Library in Iowa City.

Morgan, cops say, was inside a restroom when he “partially turned his body towards the victim/witness who was using a urinal in the bathroom.” Morgan then “measured his penis against a cardboard ruler,” according to a criminal complaint.

The victim told a cop that Morgan subsequently “made a comment regarding his size.” The man added that atop two of the urinals there were cardboard rulers with “dark sharpie markings regarding penis size.”