I found a reference to It in S1 E20a of Spongebob, "Hooky." I haven't seen this referenced anywhere online, so everyone needs to know (minor It spoilers) : r/stephenking
YARN | Stop, Patrick! Don't touch it. | SpongeBob SquarePants (1999) - S01E20 Hooky | Video gifs by quotes | 295b62e0 | 紗
YARN | You are a liar, a deceiver! | SpongeBob SquarePants (1999) - S01E20 Hooky | Video gifs by quotes | 5db9e12b | 紗