Ask me how many megapixels my camera has. I will usually reply, "who gives a s***?, I can probably take better pictures than you with a Quaker Oats can with a pinhole poked in it."
I guess I'm in a bit different category. I barely get mad and what "upsets" me is whenever my camera equipment shipping is delayed (normally from Nikon Service Center). I hate waiting for my goodies to arrive.