I left a store bought one of these in my yard last year, I forgot to take it down or shut it off.Anyways while I was packing things up for the next few days I kept hearing this moaning sound.... I just couldn t figure it out,Where was it coming from?" I'd forgotten that it was even put up. finally after 3 or 4 days i just happen to look up and there it was... just a swingin. lol what a dope huh.