Allegedly, weasels go “pop” – not really sure how, why or the actual mechanics of it though. A snarly fold (partly invented) from a ferret-like figure, today’s model is a weasel:

Why a Weasel you ask? I am programming a “bang the weasel” game with my IPT students, and it seemed as good an idea as any for the model. It helped me realise I had no idea what a weasel looked like (thanks google for helping out) – quite happy with the model given how much of it had to be made up on the spot.