Silent vs. Voiced gags: one led to the other. But both are still being used in film. Steve Martin demonstrates this in "L. A. Story," when he goes roller skating past classical art works. No words needed. And in many silent films you see the actors talking—watch carefully and you can often decipher what they are saying. They were acting, but the camera was unable to pick up their voices. So, silent or with sound, a good gag works, whether physical or verbal. The genius is in the performer, not the recording device.