If a result is incredibly hard to replicate, that's a good indicator that the effect is either so niche, or so small, that it's not actually telling you any details of the world worth talking about.

If 'priming' only works every wet Tuesday in February, after someone has had a cheeseburger with no sauce and took their Grandma to the bingo, perhaps there's some _actual_ interesting artefact explaining it...or it could just be random noise.