Here's a description of the session "Slapstick: How Did They Do That?" from the festival's website (http://www.watershed.co.uk/cgi-bin/WebObjects/Watershed.woa/wa/exhibit?object=946): "Buster Keaton dives into solid concrete, swings across a waterfall to rescue the girl, and runs into a cinema screen to become part of the picture. The incredible stunts and special effects in silent comedies were all done before process screens, multiple printing and CGI made them much easier. Peter Lord (Aardman Animations) and David Wyatt from BBC's Vision On join Graeme Garden of The Goodies to explore how these stunts and tricks were done in those days and to explain how they recreated them for TV in the 70s and 80s. Featuring clips galore, both from their own work and from the silent comedies that inspired them."