If you’re not familiar with the Adventure Time mythos, this amalgam of Simon and Marcy as Joel and Ellie from The Last of Us might be lost on you. If that’s true, I’m just going to suggest that you start watch Adventure Time from the beginning, and then understand the reference that way for yourself.
There is a good reason why Adventure Time is one of my favorite shows on television. I cannot recommend it enough. And for the naysayers out there, I recommend you watch the video below, and then give it another chance.