Was in Huntington Beach last year and these were everywhere. Stopped to see why everyone was wearing one:
Me: What are these things?
SnakeOilSalesman (SOS): Power Bands - gives you more core strength, better balance.
Me; How?
SOS: Algorithms
Me: What?
SOS: It's got algorithms embedded in this chip in the rubber?
Me: What do you mean embedded?
SOS: Algorithms....written on this chip.
Me: What do you mean "written"?
SOS: Algorithms
Me: Well what are the algorithms computing? What's powering them?
SOS: Your body's energy.
Me: But I don't understand?
SOS: Algorithms. Algorithms. Do you want one or not?
Me: Not.
SOS: Suit your self. Thanks for stopping. Algorithms. Holograms. Core strength. Algorithms.