Next up on Game Theory: Mario and Luigi are the same person

Holy shit, I actually remember seeing this happen when I watched this when I was younger. Like, seriously, how do you make a mistake like this?

"Hey, Fred, check out this coloring job that I did for Mario, pretty cool, huh?"

"Tom you fucking idiot, that's Luigi! He's supposed to be green!"

"Aww man, Fred. I guess I just forgot about those 20 previous frames that I colored. Oh well, we'll just leave it in."