I must be in with the wrong crowd as I've seen very little bad behaviour by spotters in general. The odd one or two that go a bit OTT but in general pretty good as any visitor to the AVP at Manchester will testify. I have to say that I can't think of any incident where spotters have caused any danger to aircraft or aircrew. Most are pretty savvy about what is safe and what isn't. Many, like myself, are in the industry anyway so are well aware of what constitutes suitable behaviour.
I think simon speaks a great deal of sense
Now that is funny!