You can slaughter a lamb painlessly and still serve its head. It's nothing more than making more visible what's been going on behind the scenes every time you eat meat. Yes, you're eating a dead animal. It was raised and murdered just so you could eat it.
But to me that video with the frog being skinned alive is just needless sadism and nothing else.
https://en.wikipedia.org/wiki/Svi%C3%B0