MANKATO, Minn. (UPI) -- A U.S. Airman on leave in Minnesota said he was "sorely mistaken" when he thought it would be incredibly funny to give a police officer a wet Willy.

Riley Louis Swearingen, 24, of Goldsboro, N.C., pleaded guilty to a misdemeanor disruptive intoxication charge Monday in connection with a Saturday incident involving the defendant, two moistened fingers and both of a Mankato police sergeant's ears.

District Judge Kurt Johnson heard Swearingen, who is visiting Minnesota while on leave from the Air Force, was boarding the "drunk bus" after the downtown bars closed early Saturday, when he decided to carry out a wet Willy prank when he spotted a uniformed police sergeant. Swearingen licked a finger on each hand and then inserted them into both of the sergeant's ears, the court heard.

Cmdr. Jeremy Clifton said Swearingen was immediately arrested.

A charge of assaulting a police officer with bodily fluids was dropped in exchange for Swearingen's guilty plea.

"I thought it would be incredibly funny to give a police officer a wet Willy, to which I was sorely mistaken," Swearingen told Johnson. I'm incredibly sorry for what I did. I never thought I would be going to jail for the weekend.

Swearingen was sentenced to the three days he had already spent in jail and ordered to pay $77 in court costs.

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