1) hold their own hands (more often than not, massaging one hand with the other).
2) talk to salespeople whilst getting rung up at the register - in conversation - as if they and the clerk were sitting down together for a nice chitchat over a cuppa - instead of having a brief customer-to-salesperson encounter.
3) carry tissue (aka Kleenex) in their pockets.
4) touch the skin at the throat of their neck.
(to be continued...)