As a kid, I strapped a Nerf gun to my bicycle so I could dive bomb the neighborhood kids, while traveling—I imagined—at five times the speed of sound. As an adult, I’ve carried a foam-firing blaster to no fewer than three jobs. But a funny thing happened last year: I realized my old guns weren’t any good anymore.
Christmas in July? Not quite. Last Friday evening in Tokyo, a mysterious foam started bubbling up, covering a street in the ritzy Ginza area. People wondered what exactly was going on. Apparently, there was an easy explanation for the surprising sight: forty liters of body soap.