As a child, my mom constantly harped on my posture. I don't know why I'm saying it in the past tense- to this day, she still gets on me about sitting up straight. She used to come behind me, put one hand in between my shoulder blades, grab one shoulder, and push it back until I sat up straight.
Oh so comfortable.
So I'm tempted to tell her about this because it would mean less painful reminders from my mom. But it also might mean that I'm constantly twitching like a dog with an invisible collar on.