Ran across a link on DPReview of a chap who over flashed himself: http://forums.dpreview.com/forums/readflat.asp?forum=1036&thread=29916692
As you will see if you read it I mentioned that I had the idea long ago of putting my flash in my mouth and firing it with the shutter open. Yes I made sure that my flash was NOT powerful enough to cause damage, no I am not that dumb, close..... but not quite.
Anyway here is what I got:
Second Try Two flashes