This is, genuinely, one of the funniest memes I have ever come across. I wish to make an attempt at explaining why.
Firstly, this is a picture from an out of character interview with Freddie Prinze Jr, and yet he refers to Shaggy – not Matthew Lillard, who is the actor who played Shaggy. This implies, on some level, that Shaggy isn’t being played by an actor, or that Matthew Lillard himself is Shaggy.
Secondly, Fred is, to an extent, the straight man in Scooby Doo. For him to be recounting this event implies it actually happened.
Thirdly, ‘killed god’? Shaggy, the scaredy stoner who is first to run away from whatever foes the gang face, killed god? Then, he walked onto set to announce it? ‘Announced’ implies there was some gravitas to his proclamation that god is dead by his hands, but announcing it walking onto set implies that killing god was done casually.
What was his motive for killing God? Also, how did he kill god? These questions aren’t answered or addressed at all by the meme. Freddie Prinze Jr is also mentioning this as a casual aside during an interview?
Combine the sheer absurdity with the fact that I have seen the live action Scooby Doo films an unhealthy number of times as a child, and it all comes together to be extremely humorous to me.