Pen Thru Bill

Pen Thru Bill: A standard black Bic-type pen is shown, and a dollar bill is borrowed. The pen is visibly thrust through the bill. Then the pen is slid across the bill, seemingly tearing it, but when the bill is examined, it is completely intact. 

Both the bill and the pen may be examined with no clue as to the method. You are supplied with the special pen and detailed instructions. Any denomination of bill may be used.

This is a simple effect with simple props. Easy to perform.