The "Your Mum" exchange between David Cameron and Jeremy Corbyn showed how Parliament can be an unforgiving place. But the political insult has a long and noble history.
While MPs have to abide by rules set down by the Erskine May hand-book, prohibiting "unparliamentary language" such as "stoolpigeon" and "guttersnipe", many have hurled abuse regardless. But which really did happen at the heart of British democracy?