It happened outside a hotel in Australia. Both cars were Lamborghini Aventadors with a price tag of about $500,000 each. The guy who posted the video says they were rentals.
In the video, the valet doesn’t seem to realize what a big deal it is. He just laughs the whole time. It sounds like he meant to hit the brakes, but hit the gas instead.
(Careful! The video includes lots of F-bombs.)