For anybody that doesn't know what Googlewhacking is, it's when you put two real English words into a Google search and it returns one, and only one, website. It's supposed to be pretty difficult but I didn't have a big problem with it. Just pick one very esoteric word (medical terms would work very well) and then match regular words until you get it right. I got a Googlewack on my first try (very lucky) and then again after a couple dozen more.

sanguinous + pimple = Googlewhack
sanguinous + dentifrice = Googlewhack