I can't remember if it was Vegas or texas, but one time I spent the spring living in an old RV which had been parked for a while, one of those kind you access the engine from the driver compartment. After sleeping in it the whole spring we decided to see if we could get it to run, popped the engine cover which was literally a couple feet from our heads, and uncovered the hugest nest of black widow spiders I ever saw. There were at least dozens of them, maybe a hundred or more, infesting the engine cavity. We sprayed hell out of it and killed them, but none of us were brave enough to reach in there to tinker with the engine after that, and we got so creeped out we moved soon after. Nobody could sleep...