The Inconveniencing (Season 1, Episode 5) Credits Code

Here's the code thingy for "The Inconveniencing". First off, the code letters read, "RQZDUGV DRVKLPD!" When decoded with method #1 (Caesar method or Three Letters Back rule), it says "ONWARDS AOSHIMA!" because when Mabel ate the "Smile Dip" as a spoof on Fun Dip, she hallucinated a dolphin like creature she called, "Aoshima".
Code: ONWARDS AOSHIMA!
Method #1

Smiledip! I thought this stuff was banned from America!