Mad World was one of my favorite songs. It was great as originally sung by Tears for Fears, and, dare I say, made even better when Michael Andrews and Gary Jules covered it in a slower style.
So. How do you improve a song that's already great to begin with? You let Smeagol sing it.
Here's YouTuber James Walters singing Mad World as Gollum/Smeagol from The Lord of the Rings:
Hit play or go to Link [YouTube] - via Blame It On The Voices
Very well done, sir.