Mandurah Police are investigating after a man threw a drink at a McDonalds Secret Harbour employee after being told an item he wanted was not in stock.
The incident happened about 9.30am on Saturday, February 17.
"About 9.30am, a man driving a white tray-top ute, was in the drive-thru section of a fast food outlet on Oneida Road. After the man was given his order, he requested an item that was not currently in stock," a WA Police spokesperson said.
"When advised of that, the man threw a drink through the window, which struck a teenage staff member in the face. He then drove away."
Police are urging anyone with any information relating to this incident to contact Crime Stoppers on 1800 333 000 or via www.crimestopperswa.com.au