The following scene is not for those with weak constitutions.
Wikipedia has this to say about it:
It has been suggested that the scene is one of the most repulsive in twentieth-century cinema. Director Quentin Tarantino has confessed to being nauseated by this scene, but critics with stronger stomachs have praised its dark humour. (Leonard Maltin noted it as “an unforgettable scene, like it or not.”) It was filmed in the Porchester Centre, a public building owned by the City of Westminster on Porchester Road, London.
FYI, Mr. Creosote is played by Terry Jones.