Facial expressions, I always ask mother what face she's pulling, sometimes mid rant, because she looks contorted as though upset, which leads to me constantly appologising.
"What??" is not a verbal tic, I merely find myself confused several times daily, "What?! Have I done something, what's up seriously?!" Interacting with my family takes effort at times, expecially when I need to put a point accross, mother and I write to eachother a fair bit lately, keeps any reactions at bay while we figure out eachothers points of view.
In terms of below neck body language, I can't say I've noticed mis-communication, obviously if someone tries to hug me, i'll scew my face up and move away.