You may have driven over where I805 crosses I8. Directly beneath this is a Dave and Busters. The interchange between the two freeways is a little scary. At a few points, its more than 80 feet up.

Anyways, this happened:
http://www.nbcsandiego.com/news/local/Man-Arrested-in-50-Ft-Freeway-Fall-Crash-276827111.html

Some asshole forced another guy off at a point he was 50 feet up.