Remember when Hey Arnold! was one of your favorite cartoons in the late '90s?
Get ready to take a trip down memory lane because there were two nuggets you probably missed while watching the show all those years ago.
Did you ever notice in the episode "Weighing Harold" that there's a direct reference to SpongeBob SquarePants?
Still not impressed?
In that very same episode, the powers that be over at Nickelodeon hit us with another easter egg: A CatDog reference.