try this one on for size.
what if we can all fly? bear with me. what if we can all fly, but everybody thinks that they're the only one who can fly, so nobody tells anybody else and we're slowly losing the ability to fly, as a race? perhaps, everybody can fly but we're all afraid of being judged, so we keep it secret. slowly, fewer and fewer people will pass on the proper genes to enable their offspring to fly, and then we'll be fucked when the mole people come out of their holes in the ground.