David Domoney watching as the last of 15 piranha fish is released into the tank on Aqua Hortis, his underwater plant biotopes in the Great Pavilion. The guy holding the bag actually put his fingers in there to slit it open and let the fish out. Brave, brave man.

This was the picture a nanosecond after the bag was open. Fish was to bottom right about 2cm out of the picture. These little beggars move far, far faster than the speed of a camera shutter.