Years ago if you saw someone talking to themself, they were likely crazy. Today, though its difficult to tell. I was at the airport last week and this guy was just talking away. At first I responded to him. He looked at me funny and then just kept on talking. I thought to myself, "don't look at me like I'm crazy, buddy, you're the one talking." He stood up and turned to walk away and I realized he had a Bluetooth headset on his ear. I wish people would quit doing that.