Frank N. Stein, one such sufferer of the Poople Plague. Art by Mick McMahon.
Poopleism (or the Poople Plague) was an illness that existed in Medieval Swansea, according to the Decap Attack series. Although invisible from the outside, poopleism gives its sufferers an intensely upset stomach that, the rumbling from which can be heard from a great distance. Despite Professor Frank N. Stein attempting to prescribe Bicarbonate of Soda to patient Gareth, he refused the treatment. Local doctor Daffyd Leek soon arrived and produced the expected remedy - leeches and a fish to sit on!
Using his time machine to return to present-day Castle Frank N. Stein, the Prof realised that he had caught the plague from Gareth and immediately sent Igor to the fishmongers.