I bought a pair last year and have taken it on a few trips. It's been great for certain activities where I want to take pictures/videos but don't want to have a phone in my hand (like on a boat or parasailing).
Another thing I noticed is that it allows me to record videos while staying in the moment. I took some videos with my wife and captured some cute interactions and conversations that I wouldn't have been able to record with my phone.
Most of the photos and videos don't turn out great because of the camera/mic quality and because you can't see what's in frame but I got some fun videos from them.
I did that. Unfortunately you'd have your stereo blasting, right? And then the second you upload it somewhere you'll get a copyright infringement notice and they mute the audio. Thanks Facebook.