‘O-kay, it’s all wound up,’ said Detritus cheerfully, hoisting the humming bow on to his shoulder. 'Where should I fire it, Mister Vimes?’
‘Good grief, not in here! This is an enclosed building!’
‘Only until I pull dis trigger, sir.’

        - Terry Pratchett, “The Fifth Elephant”

That is the closest I’ve ever seen to my mental image of Detritus. It may /replace/ my mental image.