A TEENAGER allegedly threw a phone at one car and jumped on the bonnet of another in Birkdale on Saturday night.
The boy, aged between about 16 and 18 years, appeared to be trying to wave down vehicles while standing in Birkdale Road about 10.45pm.
Police said he allegedly threw a mobile phone at a car hitting the windscreen and causing it to shatter.
He then jumped onto the bonnet of another vehicle before running towards nearby sports fields.
The teenager was reported to be wearing a black shirt and black jeans and was tall and skinny.
Anyone with information is asked to contact Crime Stoppers on 1800 333 000 or via crimestoppers.com.au.