The same thing happened to me on Saturday. I was over watering the hummingbird garden at a local nature center and the darn sprinkler kept jamming so I had to turn to hand-watering. A juv. Ruby-throat followed me everywhere completely facinated by the jet of water. I guess it was new to him, as no one had taken the trouble to water the garden through our several week rain-free period. Thank god most hummingbird plants are zeric. Don't you just love the way some hummingbirds look you straight in eye.