Ok, I'm inclined to check this out. Chip Chick tipped me off to a tour currently being offered in San Francisco. The Events West Tours & Travel rents out a trolley that sits 35 people, and subjects them to your caterwauling, I mean singing, while they tour the city. The karaoke-ready trolley is outfitted with a karaoke system that includes a DJ, amplifier, flat panel monitor, DVD Karaoke Machine, and microphones. Time to bring the house down, American Idol style. 
"Hop on board and sing your heart out San Francisco! This San Francisco karaoke rental is a rolling good time! We provide a professional DJ, and Karaoke setup aboard the car, you provide the talent! Charter a Karaoke Cable Car today! This Motorized Cable Car has seating for 35 passengers - however if you need room to "belt it out", you may want a little less than a full house, or Not! We know you'll love it when you try it, so come on down! This "Trolley" has a fabulous karaoke system onboard (including DJ, amplifier, flat panel monitor, DVD Karaoke Machine, and professional microphones) plus AM/FM CD Stereo system with deluxe stereo speakers for your pleasure! Come give us a listen." Product Site
