We have a feeder on our front porch. One evening my wife and I were sitting out there, and a hummingbird came and hovered about 16 inches from my wife's face. It then flew over to the feeder, then back to my wife. She then realized that the feeder was out of food. You don't want to mess with an irate hummingbird. (Smart little devils.)
You're right! They LOVE bright colors. They fly onto our back porch a lot and into our garage (we have one of those pull cords with a red tag on the end for our garage door opener). But they can be just as bad as a blue jay when they are angry.
I've taken some wonderful digital pictures of them with my camera...it's hard to do but if you're patient, you can get them!