[Alex Murphy]

They point to one particularly extraordinary artefact as evidence that she existed – a wooden chair with a hole in the seat which, it is claimed, was used for 600 years to establish the gender of would-be popes in the wake of the Pope Joan scandal.

[Virginia Ridgerunner]

Yeah, that was what I was thinking too...

[Petrosius]

Are they talking about something like this:

Replica of a marble commode used in the Vatican, Europe, 1601-1900

Credits: Science Museum London

This is a copy of a commode used in the Vatican, the residence of the Pope, who is the leader of the Catholic Church. Underneath the commode, a chamber pot would have been placed and emptied after use. The item was bought from a private collection in 1932 by one of Henry Wellcome’s collecting agents, Captain Peter Johnston-Saint.

An apt place for their "theories".