Any figment of a deranged mind. From the infamous city council meeting of Charlotte, NC where local David Thompson complains about a "rogue helicopter pilot on the loose" who hovered over his property and then bailed out. Thompson is also the inventor of the crazy-person term "the bundling". The video is widely available on the Net.
Don't listen to his conspiracy theories, that guy's not taking his meds. He's just seeing rogue helicopter pilots.