Slice em and dice em using a video editor. Re-consider though, as once you get banned for copyright infrigment, especially of like 5+ videos, then you'll be banned like dracula with a stake and garlic through his heart, never to return on any new night.
I press upon people if you want to make it on yotuube easily and withouth the copyright hassle, study animations, there are more single frame every few seconds animations and voice overs that are popular than ever before.
I suppose if you ahve no imagination, and wern't played with as a child or bought birthday presents to help spark your curisoty, and you know for a fact you have no skills, no talent, and no hope, then sure, copy peoples content and get banned and go down in a blaze of glory! lol (im emphasising you should aim high, as all these things are unlikely, you can go beyond copy and paste creativly)!
