I recently attended a friend’s wedding and had to constantly explain to people why I wasn’t photographing everything at every given moment. The number one rule…Don’t piss in another photog’s Cherrios. What I mean is, don’t show up to a wedding or an event with all your pro gear and start shooting over the hired photographer. With that said, Photocrati has a great blog post this morning about the infamous “Uncle Bob”. Give a quick read and let me know your thoughts.
http://www.photocrati.com/wedding-photography-and-uncle-bob/
StudioEightOneSix 
This is a great commentary…and the irony is my Uncle Bob would totally pull that shit…. if he would take his headset and /or turn off his portable tv long enough to do so.