Annoy Squidward Day

Annoy Squidward Day is a holiday celebrated on January 15, in which those who celebrate it annoy Squidward Tentacles. Not suprisingly, it seems to be on every day in the calender, but actually, it's the one where they do it the most. It appears on a calendar that appears in the episode Employee of the Month. It is mentioned when SpongeBob asks Squidward what day it is and he replies "Annoy Squidward day?" SpongeBob said then, "No, silly! That's on the 15th."