I wander to the copy machine.
"Okay, now this is... ...what?" I say aloud, puzzling over paperwork. "Oh, I see what you did there." Problem solved, I poke buttons on the machine and then get back to work.
My aunt approaches the copy machine, muttering, "Well, why would you do that?" to the paper in front of her. She sees me watching and says defensively, "Yes, I do talk to myself!" and laughs.
"You're not crazy," I reply, "you're just pretending that you've got an invisible assistant."