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The anniversary of a webcomic called Homestuck, which started on April 13th, 2009, and ended on April 13th, 2016. It is also the birthday of one of the characters in the comic, John Egbert. It is also a reoccurring number in the comic.
Rose: What day is today?
Dave: It's Homestuck Day!
Rose: You could've just said it was 4/13.
by Salty Squid May 03, 2017
Happy St. Patties Day!