WEISENSEL'S FAMOUS SPLINTER FROM THE HAND
'Another Close Up Cavalcade' by Jerry Mentzer (Page 152)
This effect is not for the squeamish, but with the popularity of 'Geek Magic' (Human Blockhead, Eating Glass etc) I'm surprised this trick has been overlooked.
But hey, it's hidden in a magic book.
The magician notices a splinter in his or her hand and gives a spectator a pair of tweezers so they can help remove it. As they pull, the tiny splinter emerges as a massive four inch long one! It actually comes right out of the flesh of the hand.
What a great effect to really freak your audience out. Perfect for impromptu street magic too.