Beamer

A beamer was a type of delivery in cricket that the Fifth Doctor didn't "normally bowl", but which he nevertheless once used to disable a grandparent scorpion threatening to eat Rupert Von Thal. Nyssa punned that the scorpion had been "bowled out". (AUDIO: The Boy That Time Forgot)

Behind the scenes
Unremarked in the story, though certainly implied by sound effects, is that a beamer is a bowl which does not touch the ground before hitting its target. The bowl is illegal in cricket as it poses an unacceptable risk of injury to the batsman, which is why the fair play-minded Fifth Doctor would not have "normally" bowled it.