Eh I lost some special talent because I trained myself to write
with my left hand during boring lessons?
I think you meant it in this manner: Individuals who are right
hander usually have their left brain as the dominant side, and thus
have more logical thinking processes and reasoning. People who are
left hander are right brain thinkers, and are therefore more
creative than their right handed counterparts.\
It's quite a loose association, but eh, you can't really make
yourself more creative by using left hand to write as far as I
know.
EDIT: opps I almost forgot I can't post links. Just google "left
handers more creative" if you want to get a bigger picture.