The battle between straight and safety razors, raging since way back in 1906, as displayed in this early version of Popular Mechanics. The link takes you to an advertisement for the Radiumite straight razor, which declares:

"Throw away your "safeties" and other unnatural, amateurish, scraping, smarting, ripping, inhuman shaving devices. Shave in the natural way with a standard razor"...

and if you scroll up to page 502, you'll find and ad for Gillette safety razors which argues back:

"No stropping, no honing, no waiting, nothing to learn, nothing to adjust, always ready, always sharp, absolutely safe"...

I wonder how many shavers came to fisticuffs over this.

Popular Mechanics - Google Books