Upstream Staff
From Jenny Everywhere Wiki
The Upstream Staff was a temporal manipulation device developed by the Collective of the Retconning Crocodiles, which would make its wielder's time-stream run backwards relative to their environment — though in discrete chunks, corresponding to turns in a conversation, rather than moment by moment. A Retconning Crocodile travelled to the Cupid Homeworld and showed the Staff to a Cupid, but they both got angry due to talking at literal cross purposes because the Crocodile had inadvertently activated the Staff. (COMIC: Crocodile Time)