Okay, here it is.

the handshake. hairy hands not a prerequisite

So, you start with your hand in the ‘W for Wellington’ shape. Connect with your partner following the Welly footpath rule of staying left (ie. your leftmost finger should be on the outside of their rightmost finger). The join should be made up to the middle knuckle. Then (the coup-de-grace!) curl the ends of your fingers over. You’re now making a symbolic representation of the hilly Wellington landscape. Slide the fingers apart (symbolic representation of a catastrophic earthquake, if you’re so inclined), and you’re done.

So cool.