Known April Fools' Day pranks
- 1979: Caractacus Phelps dropped over eight-hundred Stink Pellets off the roof of the Daily Prophet office in Diagon Alley, causing approximately five-hundred cases of Stinkitus.
- Before 1994: A witch sneaks up behind Alastor Moody and says "Boo!", causing an over-reaction on his part.
Behind the scenes
- Fred and George Weasley were born on 1 April, most likely as a reference to this Day, as the twins are notorious pranksters.
- The video game review site IGN is well known for making hoax videos on April Fools' Day. In 2011, their hoax was Harry Potter themed: a fake television spin-off called The Aurors.
- In Chapter 2 of Harry Potter and the Order of the Phoenix, when Aunt Petunia confirmed that Dementors really existed, it was stated that "Uncle Vernon looked from Aunt Petunia to Dudley to Harry as if hoping somebody was going to shout 'April Fool!'"
- Harry Potter and the Goblet of Fire (First mentioned)
- Harry Potter and the Order of the Phoenix (Mentioned only)