Manchester United wished followers on their official twitter account a happy World Smile Day.
In case you have never heard of World Smile Day it is celebrated on the first Friday in the month of October every year.
— Manchester United (@ManUtd) October 7, 2016
The idea for World Smile Day was started by Harvey Ball and it was first celebrated in 1999 and held annually ever since.
Harvey was responsible for creating the iconic smiley face graphic according to the official World Smile Day website.