Buying bike lights on Amazon

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Better have bought that light after that answer.

If you are cycling at the speed of light, all of the forces that hold you and the bike together, even at the subatomic level, will no longer work the same, as they traverse at the speed of light (for gravity and electromagnetism) or less (strong and weak nuclear). You would dissociate into a series of sub-subatomic particles and release a huge amount of energy, annihilating whatever happens to be in your proximity. Also, you would never be able to reach that speed to begin with.