Usually I shave in silence, especially when I'm in "research mode." I'll often have one thing in mind that I've worked at before or have recently picked up on the forums. I'm thinking about that thing, and trying to feel for the feedback. If I already have music or my podcasts going, I'm likely to get irritable trying to split my attention and turn them off.

If the family is up and around, though, I'll open up the bathroom door for passing conversation and to hear what-all's going on. Sort of like people who prefer to study in a coffee shop than alone in a cubicle.