Wichita police are looking for a man who approached a customer in a McDonald’s drive-thru lane, bashed him on the head and walked off with less than $10 in cash.

The weapon is described as a rock the size of a baseball.

The Wichita Eagle reports the incident happened just before 11:30 p.m. Monday. The victim told officers the man walked up to his vehicle, asked what he was doing and clubbed his head with the rock.

The assailant then walked away with the victim’s $8.

Police Capt. Troy Livingston says the victim was not seriously injured.