About Charlie Day:
Charles Peckham is an American actor, musician, producer, comedian, and screenwriter. He is best known for playing Charlie Kelly on It's Always Sunny in Philadelphia, and for his roles in the films Horrible Bosses (2011), Monsters University (2013), Pacific Rim (2013), The Lego Movie (2014), and Horrible Bosses 2 (2014).
Starting out, I bet I didn't get a lot of parts because of my strange voice. I'm not consciously thinking, 'Hey, sound like a squeaky dog toy mixed with a bagful of rusty nails.' It's just what my voice has done.Charlie Day