lark

‘Ha! ha!’ laughed Master Bates, ‘what a lark that would be, wouldn’t it, Fagin? I say, how the Artful would bother ’em wouldn’t he?’

DOOLITTLE. […] thanks to your silly joking, he leaves me a share in his Pre-digested Cheese Trust worth three thousand a year on condition that I lecture for his Wannafeller Moral Reform World League as often as they ask me […].

HIGGINS. The devil he does! Whew! [Brightening suddenly] What a lark!