Push Pen Anxiety

Push pen anxiety: A psychological state characterized by one's excessive push-in push-out of his or her retractable pen due to stress or boredom.

Example:

*click click* *click click*

That kid at the back of the class has a serious case of push pen anxiety.

Source: Urban Dictionary

P/S: Surprisingly, this often happens in the teachers lounge. Apparently, teachers are so free nowadays.