I have a hummingbird feeder in my closet that I would love to put out... but I live in a studio apartment and I don't have any outside space (we aren't allowed to hang things out of our windows). So the feeder has to stay in my closet until I get a house.
A couple of years ago when I spent the summer in Alaska, we kept a jar of fresh flowers on the picnic table between the trailers (I was a tour guide in just about the middle of nowhere) and had regular hummingbird visitors. My coworker had a close encounter one day while she was sitting out there, and the bird actually stuck around instead of doing a fly-by. Unfortunately I didn't know it and opened my door and scared it away.