Out in backyard smoking a cig. then it flew into view, a big dark flying rectangle. no lights, looked metal ( not a balloon or plane or helicopter). i live not to far from ontario airport. but this was nothing from there. because of how backyard is, i saw this thing for about 30-45 seconds. flew low, not very fast and nothing coming out of it. no sound. i told a friend and they told me about you guys. it was weird.