A Regurgitating Toilet was a toilet jinxed by wizards to prank unexpecting Muggles. When the flush chain was pulled, they regurgitated their contents rather than flushing them away; Muggle plumbers were very confused by this magical phenomenon. Due to such a prank being too trivial for Aurors to handle, it was up to the Magical Law Enforcement Patrol to catch those involved, though it was left to Arthur Weasley in his job as head of the Misuse of Muggle Artefacts Office to investigate these incidents and perform the appropriate anti-jinx, which was described as "simple enough."
Willy Widdershins was responsible for three regurgitating toilets in Wimbledon, Elephant and Castle, and Bethnal Green over the summer of 1995. One of his toilets backfired, and he was critically injured, after which the Magical Law Enforcement Patrol was able to arrest him. To avoid prosecution by the Wizengamot, Widdershins provided Dolores Umbridge with details on a student gathering in the Hog's Head.