If we are looking for strange places to trapese here is a manouver I pulled off accidently.
A few years back after a near pitch poll I (crew) swung around the front of the mast and ended up upside down still hooked in with my head and shoulders under the water, feet in the air and stomach being pressed hard agianst the front beam as the boat was still moving quite fast.
I was unbale to pull myself up because of the force of the water all I could see and hear was white water.
My helm says he slowed the boat down straight away but it felt like an age and I still claim he was waiting until he got to the next mark.
I think we may have invented a new sport freestyle catamaran sailing!!