Just a guess:
They have TIVO.
They were watching the weather.
They rewind their TIVO.
They decide the world must share their joy, but don’t have the knowledge/skills/gear to xfer TIVO data to youtube.
They make do with using their phones to record their TV as they play it back because they DO know how to get phonme video online.
Again, just a guess. But it is also my guess that they are almost infinitely more fun to hang out with than you and your sanctimonious, judgmental ass. (Yes, I see the irony in my last statement, but I stand by it.)