The rambling, funky ride called Banjo Billy's Bus Tours, in Boulder, Colo., is equal parts history, crime stories and comedy. It's all woven together by John Georgis — better known as Banjo Billy — in a playful, "choose your own adventure" style.
"You can either choose a PG tour, or a PG-13 tour, or an R-rated tour," he tells one group of riders. The crowd chooses the R-rated version, but they have to work for it.
"If you want the R-rated tour, you gotta say it like a pirate," Banjo says, drawing a bunch of "arrrrghs" from tour-goers. "R it is!"