I read from page 1, GREAT STICKY!

This stuff directly impacts me in music production.
I think in my case rather than sample a rap vocal or old school movie line I'd be better off using a mic in the studio and recording my own "version" of the sample. That way it's not an actual copy, and is sonically different. If it's too close to the original I could always adjust the pitch or add effects to change it up.
There's a way around it, you just have to be creative is all... Who knows, maybe I could come up with a better sample by trying to emulate the essence of an original.