Police are pursuing a Point Cook pervert who committed an indecent act in a fast food store last week.
The man, aged about 30, arrived at the McDonald's in Jamieson Way just before 1pm last Monday.
He bought food and sat at a table and was seen masturbating, a police spokeswoman said.
The man then left the restaurant and was last seen driving away in a white Ford Courier ute.
Police want to speak to anyone who saw the offence.
The man is described as being white, with a medium build, blond, spiky hair and about 175 centimetres tall.
At the time, he was wearing blue shorts, dark-coloured runners and a yellow T-shirt.
Anyone with information is asked to phone Crime Stoppers on 1800 333 000.