Harry Potter | When magic in Harry Potter goes really, really wrong | Wizarding World https://www.harrypotter.com/features/when-magic-in-harry-potter-goes-really-wrong
From the splinching of Ron Weasley to the tragedy of Ariana Dumbledore, we look back at the times when spells didn’t turn out as planned – backfiring spectacularly in a wizard or witch’s face.
Club; it conjured up clouds of rotten-egg-smelling smoke; it shot out of Ron’s hand