They had someone write a cheesy "Walking Dead" theme song, set it to shots of zombies getting killed, and used the most GRUESOME scenes possible...but intercut it with shots of the characters smiling
Just about every sitcom in the '80s and '90s did at least one episode where they tackled a serious issue...like drug abuse, drunk driving, or anorexia. And those episodes were always AWFUL. So Jest.com put together a montage of the top 50.