Sometimes people question if GTA has broken physics that allow some of the crazy stunts we see, but this stunt has actually been done in real life.
If you aren't familiar, the "Wall of Death" is a real circus stunt done with actual cars and motorcycles. There's no custom-built pit in Los Santos, so you have to find the empty swimming pool. Luckily, RedKeyMon includes the map location in the video above, but doesn't show just how the hell they got the cars into the pool!
Wall of Death [YouTube]