It's hard out there for a road comic.
I spent years performing live comedy before I realized it wasn't the life for me. I did improv, I did sketch, I even did a little bit of stand-up. In that time, I had some really bad gigs. Like really bad ones.
I'd have to say that being strapped to the top of a truck as it barrels through a post-apocalyptic wasteland, while motorcycles are flying through the air and everything is exploding all around you... that would probably be pretty bad. It's certainly up there for worst possible gigs. It's not quite as bad as performing at a frat party, but it's certainly close.