Next time you want to randomly discuss particle physics or quantum mechanics in San Francisco, beware of getting hit with in the face with a skateboard. I suppose they were discussing the uncertainty principle as it applies to blunt instruments of transportation and pain, and how to collapse the waveform function. And like in all of quantum physics, an odd phenomenon was observed during the experiment. The victim fell, breaking his ankle. Whether this was somehow related to the impact of the skateboard will need to be investigated further. For control, the same skateboard and participants should be used…