Could be Aliens?
I saw an older couple walking side-by-side today.
Her arms, rigid at her side. Her hands in fists, but the impression was not one of anger, instead one of keeping all her fingers neatly filed away.
His upper arms at his side, his lower arms bent 90°, meeting in the middle, with interleaved fingers over his lower torso. They were not rest on any sort of belly, the hands were being deliberately held there.
Their faces blank, their entire upper bodies practically motionless, they moved as if they were floating.
Freaked me the hell out.