Claustrophobic Productivity

Okay, listen up, Overwatch_Gamer321, you probably spend too much time gaming, and that's why you didn't get this one. The joke plays on the double meaning of 'thinking out of the box'. It literally means not being confined, while 'out of the box' is also a figurative phrase meaning innovative thinking. People with claustrophobia don't like confined spaces, so them thinking outside the box is kinda funny.