This is what happens when two of the world's most expensive car brands collide.

A black Mercedes-Benz rolled into a parked Lamborghini Aventador on Auckland's High St today, apparently after the Mercedes driver struggled to reach for a parking machine.

An employee of a shop on High Street said he was told the driver of the Mercedes got out of the car as he was leaving a parking building.

"He couldn't reach the ticket machine, and then he got out of the car and it just rolled and hit the Lamborghini."

The Lamborghini is thought to range from $550,000 to $850,000 NZD.

The Mercedes-Benz S Class retails from $197,500.

The High St worker said the Lamborghini was parked there most days.

"It's been a bit of a rark up around here," he said.