Bumphing was a common Quidditch foul that consisted of a Beater sending a Bludger towards the crowd. This immediately pauses the game, while officials rushed to protect fans who were watching the match. Unscrupulous Beaters often do this in order to prevent the opposing team from scoring.
Behind the scenes
In Harry Potter and the Half-Blood Prince during a Quidditch match in the 1996–1997 school year, Ginny Weasley may have used a variation of Bumphing as she was a Chaser and shot a Bludger at the commentator box, heading towards Zacharias Smith, who had commented badly about the Gryffindor Quidditch team.