He rubs his hands and laughs at a secret gift for Bob Cratchit—what turned his sting into mischief-turned-kindness?

"I'll send it to Bob Cratchit's!" whispered Scrooge, rubbing his hands, and splitting with a laugh. "He sha'n't know who sends it. It's twice the size of Tiny Tim. Joe Miller never made such a joke as sending it to Bob's will be!"