This is one of my all time favorite effects. It's diabolically simple and very direct. No one I've
done this too seems to notice that it is a little bulky.
Only thing is that lighting is an
issue. You can't really do this out in the sun while you're doing walk around on the streets. BUT!
It does come w/ the advice of using the wallet as a "Shiner". I haven't tried that -- but I'm sure
out in the sunlight it would work.