He swings his arms back, then flings them forward, just like a cartoon character.(minus the cool sound-effects)
John and I were talking at dinner the other night, about how some kids say bad words, like the F-word, during their rebel phase(I know, totally inappropriate conversation topic). Finn looked at us and said "I say F-words all the time...like Fireworks!"...heehee. phew. Maybe we won't talk about that again. Ever.