I posted this in my other blog, and think it is worth of a repost here (i have suffered through many a splinter, including some i had to dance through before their extraction, yuck!)
This comes courtesy of Master Herbalist, Andrea Candee.
She says, "Simply cut a piece of the ripened peel, tape it on, pulp side to the splinter, leaving it in place overnight. In the morning, the enzymes in the ripe banana will have pulled the splinter to the surface. Deeply embedded splinters may require another night or two of fresh peel."
Use this knowledge wisely, Grasshopper, it could change the world...
(ninja banana courtesy of people with lots of creativity and lots of time on their hands)