That reminds me of a business trip to Tokyo years ago. I was doing a pen test at Lehman Brothers and they only allowed us to work at night (for obvious reasons). We would hack a bit, set up some automated scripts to run, and go grab sushi around 2ish in the morning. The area we were in had a lot of bars/clubs and it was usually pretty trashed with papers/napkins flying around and bottles/cans on the ground. By the time we finished our sushi every night the area would be spotless.

We decided to stick around one night outside to see how. These little blue and/or white trucks would pull up and a bunch of little Japanese guys dressed in all blue would jump out with brooms and dust pans and clean the area in just a few minutes, jump back in the truck, and take off.

We called them the Japanese Smurfs.