Or double-ended nails.
Problem is, you've then got no surfaces for the hammer to get a decent purchase.
( The Mock TurtIe ™ --- Thinks you are a cunt, on, Thu 2 Jul 2009, 19:37, archived)

Must be like when you try to chew.

( Bud Muhnquai Update your profile or fuck off, Thu 2 Jul 2009, 19:45, archived)