I know, the title is bizarre, but I encountered the same bug a few seconds ago!
I created an old video os this:
http://www.youtube.com/watch?v=sqPHPLaBSQk&feature=channel_video_title

I got kicked now, and NO i was not cheating.
It is a strange bug, I think it is happening because I press enter & shoot .. difficult & strange.

Whats that?

Yeah I saw that once on lighthouse, really thought he was cheating...
Bizarre bug indeed.

Happened to me in the demo too