Oh I didn't forget... It was bullet #2 in the original post above.
That was really a weird deal, but I guess I can see how it can happen. For those that didn't see it, the cars were coming around the 4th turn expecting the pit open sign to be given so they could all come down pit lane... Well, the green "pit open" sign came on, but there was an ambulance slowly driving along the inside, exactly where the cars were trying to enter the pits. As cars started diving to the left of the ambulance, the make their way onto pit lane and try to avoid the commitment box/zone, they were kind of getting jammed up, and the ambulance driver must have then realized they were in a bad spot, so they stopped, and a bunch of guys accordianed into each other. Kenseth ended up with race ending damage due to contacting the car in front of him.
They only race there 2 times a year at Richmond, and unlike the NHRA Safety Safari where they have a dedicated team that goes to all events, I'm thinking that due to the size of the venues, that Nascar probably relies at some level on local rescue squads to support those that Nascar has in place, so like I said, I can kinda see how it could happen.
Maybe Kevvan, or Warren Alston will see this and will add their thoughts since it is in their wheelhouse.
The whole thing still doesn't beat the Montoya versus Jet Dryer episode, but it had all the makings of it for sure...