YouTube trick for screen off playback on note 4

So I made a cool discovery. If you want the stock youtube app to play with screen off, answering a phone call with the popup panel while youtube is playing, then letting the screen turn off by auto sensor (not by manual turn off but by putting the phone to your face), then letting the other party end the call, will resume youtube with the sound playing in the background with screen off when the call ends. screen off youtube is something long coveted by youtubers, but will now get your 3rd party app pulled from the market. so to find this trick to do it on the stock youtube app was pretty funny imo. AUCU2COC6 is the firmware version I'm running. not rooted, stock everything, so SHOULD work for you.
there's possibly better ways to trigger it without calling yourself from a second phone lol, but yeah if you ever wanted to listen to youtube without figuring out a way to pocket your phone without the screen messing up, now ya know.