Shiny things

A magpie keeps flying right up to the top of my kitchen window. I thought there might be a nest up there, or maybe on the roof, but I can't see one by leaning out of the living room window and craning my neck. Anyway, it creeps me out. I'm superstitious about magpies, and seeing one at a time on a regular basis is disturbing. I need to lure more of them to my windows somehow, five or six at once.