During Joel Hodgson and Jonah Ray's tenures as hosts (and for a brief period at the start of the Mike Nelson era), the hosts and the Mads engage in an "invention exchange" in which they each show off their latest inventions.
Under Joel Hodgson og Jonah Rays tid som værter (og i en kort periode i starte af Mike Nelson-æraen) deltog værterne og "The Mads" i en "invention exchange" ("opfindelsesudveksling"), hvor de hver især viser deres seneste opfindelser frem.