All right, we stand corrected.
That's a life-sized version of Mattel's V-Drop Hot Wheels set, a toy track that is designed to be suspended from the top of a child's bedroom door -- so naturally, they had to build a 10-story-high giant door in order to use it. The bizarre monolith was constructed at the infield of the Indianapolis Motor Speedway during the 2011 Indy 500, as part of a publicity stunt aimed at recapturing the attention of lapsed Hot Wheels fans and insane people in general.
Toys 'R' Us
The stunt ended in tragedy when a giant parent walked through the door and stepped on the car while barefoot.
While, sadly, they did not include the ring of fire at the middle (because that would be too dangerous), they did recreate the awesomest part of the set: the 332-foot jump across the infield, which actually broke the previous car-jumping world record by 31 feet of distance and 57 points of sheer holyshitness. You can watch a video of the whole thing here.
AP, via Daily Mail
If they're anything like us, they went through 10 stunt drivers before getting this to work.