How do you unbox the biggest LEGO box? Surprise one of the of the world’s most famous YouTube toy unboxers, of course.

Words can’t describe how amazing it is that Forza Horizon 4 and LEGO have come together. But opening a giant box with a full-scale LEGO car inside can. 215 McCann, Xbox, LEGO and McLaren worked together to surprise internet kid-celebrity-unboxer, EvanTubeHD, by turning his classic unboxing video into the biggest unboxing video he’s ever done. And it really is the biggest. Inside the box was a full-scale LEGO McLaren Senna made of 400,000+ pieces, which was both a huge surprise for Evan and his 6.7 million followers.

The ultimate creative playground meets the ultimate driving playground with the Forza Horizon 4 LEGO Speed Champions Expansion Pack. Roads paved in baseplates. Cities built of plastic. And cars powered by brick power, not horsepower. It’s a new world of imagination that’s waiting to be explored. Forza Horizon 4 LEGO Speed Champions is available now, with support from this campaign launched on August 12th across social channels from EvanTubeHD, LEGO, McLaren, Xbox and Forza.