Several members of the cast become baffled by things as apparently simple as a high five and a fish tank. Ardal O'Hanlon discovers that a mallet floats, Bridget Christie has a present for the Taskmaster, and Sophie Duker covers some keys in saliva.
Casts:
Greg Davies, Alex Horne, Julian Clary, Lucy Beaumont, Sam Campbell, Sue Perkins, Susan Wokoma