I have used hair conditioner when I have forgotten shaving soap and experimented a bit with it in daily use. I didn't like it at all but it does work quite well.
I've used listerine as an aftershave splash in a pinch on the road. I looked it up first when I ran out of aftershave on a long trip, and apparently it's a thong that people do. Minty fresh, and kills all the germs too!