I dreamed that I was taking a Greyhound bus to visit my family in Chicago. I boarded the bus, but soon realized that (a) the bus was being pulled by horses like a stagecoach, and (b) the driver was Weird Al Yankovic. Weird Al handed me the reins and insisted that I drive the bus, which scared and upset me -- I didn't know how to drive a stagecoach, and the horses were going really fast, careening around corners and nearly tipping the bus over. I kept screaming at Weird Al to take the reins back, but he just laughed like a maniac, and kept insisting that everything was fine.
I eventually managed to stop the horses. I screamed at Weird Al for a while and then stormed off the bus. But I was stuck in the middle of nowhere, in a bad neighborhood, and I had no idea where I was (although I was pretty sure I was still in San Francisco). Eventually another Greyhound bus pulled up, also going to Chicago; but the driver was very cranky, and since my ticket had already been torn, he didn't want to let me on the bus. He eventually did, but there were no seats left, and as the bus pulled off, I wondered if I'd have to stand all the way to Chicago.
(P.S. I really wish I could have found an image of a bus being pulled by horses, or that my Photoshop skills were up to the task of making one. That was a truly vivid and frightening image, one which no simple picture of a bus could ever convery.)