Have You Ever Pulled A Dick Move When Bird Watching?

[youtube]http://www.youtube.com/watch?v=Nf7MMNdL9Vs&feature=relmfu[/youtube] A lot of the clips for the movie The Big Year focus on the main characters faking each other out or just pulling some real dick moves out in the field--purposely making someone sick.  Has anyone ever done that?  Faked out not seeing a bird so someone else wouldn't see it?

I ask because generally I find birders are a pretty friendly lot--even during a competition like The World Series of Birding. Do people do this?  I suppose this would get into the area of ethics, you wouldn't want to flush a bird away to keep someone from seeing it, but you could give really bad direction (or make someone barfy on a pelagic birding trip).

You can keep it anonymous in the comments, I'll check the spam filter.