Hawaiian shirt day falls on April 21 of every year, so you know if you want to go ahead and uh, wear a Hawaiian shirt and jeans.
Will: Hey Eric why are you wearing that ridiculous Hawaiian shirt?
Eric: Dude it's April 21st, how did you forget about Hawaiian shirt day?
Eric: Dude it's April 21st, how did you forget about Hawaiian shirt day?
by WilliB April 21, 2013