actually it's possible to do this if u want to...i've seen it on
tv.
what these wierdos do is have calcium implanted on their foreheads,
under the skin on the skull. since our bones and skull are also
made of calcium our body will automatically `repair' the part where
tha calcium is implanted, by adding/building more calcium around
it, and horns will form as the calcium deposit gets bigger. it
grows under the skin and all.
well, what can i say...