I have used some similar to these with large black cloudbuster helium balloons and several thousand feet of kite string
I got a lot of laughs listening to the police scanner if people reporting UFO’s.
I was testing the best looking effect to create a realistic looking UFO for a contest to help investigators spot fakes.
One if my craft ended up all over the net and news shows several years ago after someone took the original video and edited out the sound and posted it as their own.
It was even on the syfy show fact or faked