i just did this trick by accident like today, so im wondering if its been done before... (-_- ;)
what i did was
shadow 23 - 34 (on my right hand), but instead of trying to put the pen in 34, position my left hand to the right of my right hand to catch the pen
heres a vid:
http://www.youtube.com/watch?v=FUYENql9NHQits a fairly easy trick, but it looks crazy @.@