There's a surprising amount of stuff that can be stored in our genes, including reflexes. I doubt this has any relevance to what we're talking about, but sometimes people with degrading genomes have been seen throwing their arms into the air when falling, which is a reaction generally found in infants as a vestige from our tree-bound days, when a falling child could grab hold of a branch to avoid death. There are undoubtedly more examples, but I don't know any of them.

Personally I don't really like prescribing everything humans do to social interactions--- it feels too much like hasty guesswork, but most of the time I tend to be wrong when messing around with things I have no idea about.