Just saw The Desert (yes, I'm fairly new to the show), and loved it!
Our heroes were coming up to that giant magnetic-center-of-the-desert rock. And Toph was so excited, a rock! Real land again! Then out of pure instinct, I said "It's a rock! A ro-o-ock. It's a big, beautiful, rock. Oh, the pioneers used to ride these babies for miles!"
And that's when I realized it... Spongebob is an earthbender!
P.S. Alright, you can start throwing the tomatoes now.