A Pen is THRUST thru the center of a borrowed signed dollar bill.
Show that it's clearly Piercing the bill. The Pen is removed and bill is returned!
Only 1 Pen is used.
You borrow a bill & and them a pen to make a mark on the bill. Now take the signed bill and stab a pen right through the bill.
You then move the pen and hole to a different spot on the bill.

You pull the pen out of the hole, but where is the hole?
NOW give the bill back to the spectator! THATS MAGIC!!