I had a loaf of very old, stale bread that I was about to throw out, and I decided to use the setup from the hot dog video to make some odd sandwiches using random stuff in the kitchen. VERY random. ...And hey, they're 100% meat-free. :)
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app