GTA V - NPCs drive off overpass and cause never-ending chain reaction explosions

When I'm bored I like to take a bus to the overpass that goes to Los Santos Freeway from Elgin Ave, near the hospital and bus station. On the overpass there's a couple sections of barrier missing, and if you wedge the bus in between the debris and opposite barrier, you can then get all the NPC traffic to funnel themselves off the ledge and plummet to the highway below. The explosions cause traffic backups which then themselves start exploding and creating further chaos as the emergency services gets overwhelmed by the never-ending traffic raining down upon them. Eventually, though, all the charred cars and corpses blink out of existence and traffic starts flowing again, until the next round of NPCs start driving up the overpass.