Cell phone or insanity?

I was watching a middle aged man stand facing a wall today. He was having quite an animated conversation with it. Sometimes raising his voice and gesturing wildly.

Now before cell phones and particularly hands free cell phones I wouldn't have been having the inner debate that followed. I'm watching him and thinking, wistfully, and longingly, about the time when I could have safely labeled him crazy and moved on with my life.

But not anymore. Now I watch him, half amused, half curious. Cell phone, or insane? Hmm.. I never did get to figure it out before my lunch break was over.