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You'd probably see flashes in your eyes, like the astronauts did on long duration flights, especially to the Moon. That was caused by cosmic rays, namely alpha particles, knocking electrons out of their orbits in the fluid inside their eyes. It's what they call Cherenkov Radiation. The electrons get knocked free then recombine with their atoms, and give off a blueish light. Same thing happens when a powerful magnetic field snaps, as it also would if something similar happened to a gravitational field. In going back to its ground state, the field causes molecules in the air (or in gravity's case, generates virtual particle pairs in the surrounding spacetime) to lose electrons which then recombine with the atoms/molecules and lose energy by giving off photons in the blue/UV part of the spectrum.
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