Solve This Pzzlr: Lets Shake On It

Neatorama presents our collaboration with Pzzlr, a site where you can always find a riddle to exercise your brain. Can you solve this one?

Dr Anne T. Bacterial, a cognitive-behavioural therapist, holds weekly therapy sessions for a group of eight mysophobics. This week the doctor insists that each of the eight group members must shake hands with each of the other members before anyone may wash their hands. Prior to the stampede to the wash-basin, how many hand shakes will there be?

We never told you there would be no math. Do you know the answer? The solution is at Pzzlr!

Look for a new puzzle here at Neatorama every Wednesday, and check out Pzzlr for a puzzle anytime!