I think I've mentioned..

that I thought the tapping was to make the scene change between drunk and sober more seamless.. you hear the tapping, while the camera is on Brody (I think) and then the shot changes back to Quint who keeps tapping.. I always thought that was to help "weld" the scenes together..

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Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..