I have a secondary behavior where I move my arms or body in kind of an up and down motion when stuck on a block. One day I'm in the passenger seat of my friend's car and as we're having a conversation I get stuck on a block, so I start doing my usual thing and he says "Are you trying to put your seat back? You know you can just use the black bar under the seat to adjust it." Yeah. That got kind of awkward for me. Come to think of it, I don't really think we've verbally talked about my stuttering once and this is one of my best friends.