Strange Sighting #3

While doing my crunches tonight at gym, the guy next to me on a fitball was chatting to someone on his mobile phone, I assumed. I continued with my crunches as he continued with his conversation.

Then he got up, and as he turned I realised, there was no mobile phone, no earpiece and no-one with him...
It was time for me to avoid eye contact, and move quietly and quickly to the nearest exit...