We have a macbook with a broken screen, and another macbook with a broken processor and case. So today Peter and I took them both apart and transplanted the screen from the one machine to the other. It is not an easy operation – the entire machine needs to come apart and there is real danger of cracking the screen when removing or inserting it. After removing and replacing dozens of tiny screens, 1:45 later we had a fully functioning machine. Success, and some good father/son time. It's true, they actually become useful as they get older. Huh.