August 21 is the 233rd day of the year (234th in leap years) in the Gregorian calendar. There are 132 days remaining.
- 1961: Stephen Hillenburg, the creator of SpongeBob SquarePants, was born.
- 1999: "Mermaid Man and Barnacle Boy" and "Pickles" premiered.
- 2006: Nighty Nightmare was released.
- August 21 on Wikipedia