There are 5 mysterious things about Michael Jordan.

1. Michael Jordan chose to wear the number 23 as a tribute to his older brother, Larry, who was a talented basketball player but gave up the sport due to his height limitations. Jordan wanted to reach half of Larry's height of 1.73m, which led to his choice of number 23 in high school. 

2. Jordan's habit of sticking out his tongue during games was inspired by his grandfather, who used to do the same when he was younger. Jordan's father also believed that sticking out his tongue helped him to concentrate better. 

3. On April 1, 1992, during a game against the Orlando Magic, someone stole Jordan's jersey from the Bulls' locker room before the game. Fortunately, the team's equipment manager had an extra number 12 jersey, which Jordan wore during the game and scored 49 points.

4. In 2001, after the 9/11 terrorist attacks, Jordan voluntarily donated his entire salary for the 2001-2002 season to the families of the victims. He saw it as his way of giving back during a time of crisis. 

5. During the 1997 NBA Finals game against the Utah Jazz, Jordan scored 38 points, despite feeling unwell. Years later, it was revealed that the illness might have been caused by a poisoned pizza that was delivered to Jordan's hotel room in Utah. He was the only one who ate it and fell ill shortly after.