1991 (MCMXCI) was a common year starting on Tuesday of the Gregorian calendar. Date Event(s) August 21 Birth of Guava Juice. September 8 Birth of Joe Sugg. September 9 Birth of Adam Paloian. Retrieved from "https://spongebob.fandom.com/wiki/Timeline:1991?oldid=3142762" Category: Years Community content is available under CC-BY-SA unless otherwise noted.