Not too sure on the validity of this story, but on studentpilot.net about five or so years ago someone posted about an "engagement" between a gunship and a viper.
It read something like the two were "playing around" after an exercise in an offshore MOA and eventually the gunship was able to bring its guns around on the F-16.
Again, could be your typical SPN B.S. but who knows, maybe someone in the know can comment on possibility of something like this happening.