Man mistakes robbery for joke

FORT GRATIOT TOWNSHIP, Mich. -- A convenience store customer was struck on the head with a gun when he mistook a robber for a friend who he thought was playing a practical joke, police said.

The masked man entered Sandler's Party Store about 10:30 p.m. Wednesday, brandished a handgun and demanded money.

Patrick O'Brien, 21, walked up to the man, thinking he was a friend, and grabbed him in a playful way, police said. The gunman then hit O'Brien in the head with his gun.

The gunman fled with an undisclosed amount of cash.

O'Brien was not seriously injured and did not seek medical treatment, the Times Herald of Port Huron reported.

He was visiting a friend at the store in Fort Gratiot Township, 55 miles northeast of Detroit.

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