Chuck Norris (the real life dude) died recently,
The post is referencing a well-known song titled “The Ultimate Showdown of Ultimate Destiny”, in which Chuck Norris (as a cartoon character, the whole song is animated) descends from the heavens, beats up Indiana Jones, kills Batman, but ultimately loses to a bunch of characters ganging up on him, including every single Power Ranger. In the end of this bloody battle, only one was able to come out alive: Mr. Rogers, in a blood-stained sweater.