For the everyday shaver, if you run out of shaving cream, you just use a dab of soap. It's not entirely satisfactory, but it works in a pinch. BUT WHAT IF YOU RUN OUT OF SOAP? According to Examiner.com, peanut butter makes for a more than serviceable price-conscious replacement (for shaving your face, not scrubbing your junk). To test this, I grew enough facial hair to look like a Seattle barista circa 1992 and then slathered my face with a veritable "glop" of peanut butter.
Or "a "diarrhea of" depending on your bathroom lighting.
Applying it wasn't terrible, as I smelt like a Reese's man. Unfortunately, I needed to hack the legume paste off my face, so I began shaving, only to stop immediately when this happened: