A 21-year-old Kansas University student landed in jail Saturday morning after mooning a police officer in the 900 block of Massachusetts Street.

Alcohol was believed to be a factor, said Sgt. Dan Ward, a Lawrence Police spokesman.

According to a report, the officer happened upon the man and another man shortly before 2:30 a.m. Saturday as they argued about whether one man had knocked a sandwich from the other man’s hand. The officer separated the two, Ward said, and was returning to his patrol car when the 21-year-old shouted to the officer, dropped his pants and exposed his rear end.

The man, identified as Luke M. Lisi, was arrested on suspicion of indecent exposure and later released from jail on bond.