Note: The original post said the car was at Coppell High School. It was at Hebron High School in Carrollton. And yes, it was driven to school by a 15-year-old, per Jalopnik's update, which you'll find below.
The car you see above is a Lamborghini Gallardo LP570-4 Super Trofeo Stradale. It's rare (only 150 exist in the world), expensive (almost $300,000 on eBay), and was apparently parked in the lot of -- wait for it --
Coppell Hebron High School in Carrolton.
Dallas' Top Speed Auto told Jalopnik that the Gallardo in question belongs to a friend of the owner of the company who has a 19-year-old son, but not a 15-year-old daughter. It's used by Top Speed as a promotional car and an R&D car, so even though they don't own it, they do know who is typically driving it and where it is.
Update at 2:17 p.m. from Jalopnik:
In an amazing twist, it appears the Redditor is actually not full of crap. We just spoke some more with Top Speed, who told us the man with the 19-year old son doesn't own the car, but is the owner's driving instructor. The man who owns the car has a girlfriend with an 18-year old son... and a 15-year old daughter. The Gallardo was in storage at Top Speed almost all summer until earlier this week when it went back to the owner. It has been confirmed to Jalopnik that these pictures were indeed taken at Hebron High School in Carrollton, TX, not Coppell High School as we originally thought, and they were probably taken yesterday. Reportedly the owner also has a Ferrari 458, which the 18-year old and 15-year old have driven "frequently." And now you have the rest of the story.
Next page: more photos of the awesome, rare car: