Trying to find a Bruce Lee quote/interview

[wacki]

Any Bruce Lee fans here? Maybe you can help me.

I remember watching a clip on TV where Bruce Lee was being interview by Johnny Carson (I think). Bruce Lee used a ton of metaphors to explain simple concepts with exceptional beauty and simplicity. For instance he described people as being similar to butterflies and how you couldn't hold on too tight. If you do they will either fly away or break. Does anyone know what I'm talking about? I'm willing to buy a Bruce Lee documentary if needed but I have no idea which documentary it was. But a list of Bruce Lee metaphors/quotes is basically what I'm after.