I had my first circle runner on my very first test run of a brand new Dick O'Kane manual targeting exercise. I was checking out some really non-standard ways of running the TDC and wasn't sure what the result would be. I didn't even know there was such a thing as a circle runner in the game. It had never happened to me and never came up in a Subsim discussion that I knew of.
So I'm wondering what's going to happen when I input a bearing without a range, press the fire button and got my very first circle runner.

For awhile I thought it was the procedure and not just bad luck. After discussion with my partners in crime I ran the exercise again and it worked perfectly several times in a row.
So yeah, a circle runner really makes you think about the meaning of life, death the universe and everything!