Phase I - Bite off the pen nib and spit it back on. Immediately, open the refill compartment, let the spectator touch the nib.
Phase II - Make the refill rise out of the pen.
Bonus - A Russian Roulette with pens, where spectators select the pens to be smashed. The whole effect is totally under the performer's control.
The video will explain you how to gimmick a pen. No special pen is needed.
1st edition 2013, 12 minutes