The hitchhiker fantasy is one I've thought about, but not one I have fulfilled. I've been the one at the side of the road in the past with my car broken down, and while several men stopped to offer help, none offered a lift (of course, being a guy myself, a woman would have been my choice in victim).
On the other side, I have pulled over to help people on the side of the road, both because of the 'I am a guy, I can help thing' and the 'I am(was) a dr/nurse/medic/lifeguard/whatever does anyone need help thing'. I've picked up a few girls from broken down cars, and while I may have fantisized about them, I also brought them all to a gas station, or home safetly. I did get a few numbers to enjoy later, but sadly, never actually played during the actual 'rescue'.