Ever wanted to go into an establishment that advertises "No shirt, no shoes, no service"? Ever been asked to leave such an establishment for lack of footwear? Here's the solution! Note that at a distance, the model below appears to be wearing real, foot-protecting, tangible sandals. Also note that the perfectly good pair of normal, not-on-the-fly flipflops are being ignored.
Since all the materials needed are pocket-sized, I figured this would make a good entry for the pocket-sized contest.
Step 1: Draw flipflops on your feet with a sharpie.
This is as simple as it sounds. I did it in the back of a pickup truck bouncing down the road on the way to a certain establishement.. at night. So it can't be all that hard. Just draw freeform. Consider tattooing for long-term barefootedness, although this might be best done in a tattoo parlor rather than a moving vehicle.
Step 2: Don't draw attention to yourself during the visit.
This step is also pretty easy for most people. I climbed on the soda racks, talked loudly, and joked back and forth at the checkout line with my friends about my plan to live in a converted semi trailer someday. Worked great, none of the associates suspected that I was in fact barefoot.
If you are noticed to be barefoot, you may get kicked out by a security guard. If it's the security guard directly below, though, I wouldn't worry too much. He's on your side. And lazy, looks like.