While not nearly as rad as our nearly-realized dream taco-mergency truck, this less flashy desert ambulance from SFDelights (commonly parked in the Wells Fargo lot near 16th and Mission) is the real deal.  They've got a rotating selection of cupcakes, creme brulee, tarts, crisps, and, presumably, can use its car battery to restart your heart when you're done eating.

(Sadly, we were not able to try their offerings Friday night, as eating red velvet cupcakes from a vehicle that used to rush stabbing victims to the hospital seemed like a cursed way to kick-off the weekend.)