If you are a big executive and have your own business card, you can cut the time it takes you to get a business card and you are at 5 seconds. The results are not professional and there is some light lost, but when all else fails, it is a neat trick to have up your sleeve. It will defiantly work for Canon internal flashes. Other brands - you might need to adjust a bit.
I got this trick in the mail from Marko Helenius. He holds a nice gallery at markohelenius.fi. Pleae go over there and have a looksy. Judging by the (small number of) studio shots, this guy knows what he is doing. Now I give the floor to Marko.