Annoy Squidward Day is a day that was mentioned in the episode, "Employee of the Month," as part of a joke. It was first shown in the calendar.
It is supposedly held annually on the 15th of February. Squidward was bothered, so he asked what day is today and he answered, "Annoy Squidward Day?" SpongeBob laughs and says that "Annoy Squidward Day" is on this day, and points to the calendar.
- If you look closely on the calendar, below the 15th is the 21st, when it should be the 22nd, so the week appears to only have 6 days. However, this could just be an animation goof. Also, despite that 19-23 are below 13-17, they look as if they're above 24-28, implying an added 5-day week.
- Later in the episode we see that Squidward's award says "January" despite the fact that the calendar has only 28 days- this could be attributed to the fact that the awards on the wall are in no consistent order and the episode is riddled with animation errors.
- SpongeBob is always unintentionally celebrating this holiday.