Spoiler whiner alert (read no further): Residents of mine shafts and deep caves haven’t heard about the third-act alien visitation angle in Indiana Jones and the Kingdom of the Crystal Skull, but most sentient beings are on to this. I didn’t realize until this morning that this MacGuffin element is based on reality, as 12 crystal skulls of an alleged ancient Mayan or Aztec origins actually exist. The unfortunate aspect, according to John Lichfield‘s 4.19 Independent article, is that they’re fakes.