Only way to keep my fingers busy in class. I do this instead of taking notes. Or I sleep, because I'm usually up until 2 in the morning. 6 hour sleep.
None.
you aren't really spinning it then, are you?
None.
I don't. Although, I have a good friend who does it constantly in both of the classes I have with him.
I doodle.

You can tell how awful the class is by the doodle to actual-notes ratio in my notebooks/binders.
None.
I don't usually pen spin, instead I usually chew on them.

same
(maybe we could have a contest who can chew there pencil down faster)
None.
Zomg... I'm gonna be able to do that some day.
None.
I can twirl it between my pointer and middle finger.
None.
what trick? there's more than one
None.
Do pen spinning with your feet, then I will congratulate you but at the same time, I'd be disgusted.
None.
sadly, I can do charge and sonic with my feet. -.-
None.
charge is moving your fingers in a scissor-like motion to move the pen elliptically
sonic begins like a charge but you bend your finger and the pen "slips" into the next slot.
None.