Does it look like this?
http://2011volt.blogspot.com/2011/07/when-is-headrest-not-headrest.html
Or you could try this....
Instructions for a Gen 1:
Tools needed: Small phillips head screwdriver.
Step 1:
Lean front seat back slightly so the the headrest will clear the roof of the car.
Step 2:
Kneel on the seat whose headrest you wish to remove facing the headrest.
Step 3:
Lift up the headrest to it's highest setting by pressing the button on the headrest.
Step 4:
Unscrew both black plastic washers (these are at the top of the place where the headrest goes into the seat) by turning them counterclockwise. Tape them to the headrest so that they're out of the way.
Step 5:
Pull the leather or cloth gently so that you can look down the hole that the headrest post is in. Notice a brass colored metal loop about 1" (2 cm) down into the headrest post hole (the brass-colored loop will be at the "4 o'clock" position if you're kneeling on the front seat facing the headrest).
Step 6:
Put your little phillips-head screwdriver into the brass-colored loop and carefully pull the loop backwards while pulling up on the headrest. Pull the headrest up as much as it'll go. This should "unlock" the side that you're currently working on.
Step 7:
Carefully focus your attention on the other headrest post (try not to move the seat as this will undo the work that you've just done in step 6!). Now do the same exact thing to the other headrest post while pulling up on the headrest. This will allow you to release the headrest completely and pull it out.
Maybe the gen 2 is the same or similar. The odds are good.