First off, let's talk about the thumbnail shall we? 

Ok, we have a very angry mario
Meggy and Tari (#megari) on the left, even though they didn't appear in the episode 

And......

WTF IS LUIGI DOING!?!?!?! Is... is that Bowser!?!?! #Bowuigi!?!?! IN SMG4!?!?!? 

#SMG4