I was a tween when I secretly watched Heavy Metal on early 80's HBO and I think it f#$ked me up cause it had everything in a cartoon (which I never experienced before).... gruesome deaths, outrageous drug use, graphic sex and hard core violence but an amazing soundtrack and I bet was funnier than I remember (it would bounce back from funny short stories to insanely violent short stories. IIRC it's about an alien energy ball that would go from place to place and give average people incredible physical power, then you see what they did with it).
Amazing soundtrack. Black Sabbath's Mob Rules being a highlight. Again as a tween that liked pop songs like the Safety Dance and Mr. Roboto.....hearing the Mob Rules for the first time at ~12 was like 'okay, bubble gum playtime music is over'.
Anyway, I'm going to try to find it again and give it a rewatch.