I'm guilty of a couple of these, namely the digital camera arm stretch, the cell phone bent neck , the computer hunchover (I'm doing it right now) and the console game couch squat. Although I can't sit on the couch, the console is too far away to reach.
And while I do admit to owning an Ipod, I keep the volume down as there's nothing more obnoxious than hearing someone else's music across the store. That and I'm terrified I'll damage my hearing somehow.
I've actually thought of this idea a lot, especially when watching movies and such. What would people who were originally terrified of the Wolfman and Dracula think of modern horror movies?