That is Jay Leno standing next to the BMW V12 extracted from his McLaren F1. Calling it "The scariest thing we have ever done here on Jay Leno's Garage," his mechanics pulled the motor to replace the Vanos unit, which was leaking.

His fright is our gain, though, as Leno gives us a tour of the 627-horsepower, naturally-aspirated 12-cylinder that powered the very car that taught us new ways to dream about supercars. The motorhead's VIP tour happens in the video below.