there is a "secret" handshake in benin that gives me the creeps. if you shake a guy's hand, and he moves his finger to your palm, it's a proposition. to agree, you return the finger-to-palm gesture. to disagree, in my case, i play dumb. but really, it's a slap-worthy offense.
i mention this only because i received the dirty handshake moments ago from a man i greet every week. and i'll see him again on my way back home. brrrrr.... gives me the heeby jeebies. if you come to benin, beware the dirty handshake!