Come the Zombie Apocalypse...

Sitting naked on the side of the bathtub.  Legs out over the edge.  Wet hair dripping into the tub.  Humming "Smoke on the Water" to myself.

David stops on his way to the bedroom.  "Are you okay?"

"Yeah.  Yeah, I'm fine."

His eyebrows low on his forehead.  "Why are you sitting there like that?"

"I'm conditioning my hair."

"Oh..."  He turns to leave... "You can't do that in the shower?"

"Oh I can.  I just don't want to waste water.  This is deep conditioning.  I'm doing this for seven minutes.  Come the zombie apocalypse, we're going to have to know how to conserve water.  I'm practicing."

David nods sagely.  "Good plan.  As you were."