Superman is Dayman, Fighter of the Nightman (Batman) in Epic Mashup [VIDEO]

What do you get when you put the combined forces of 'It's Always Sunny in Philadelphia' and 'Batman V. Superman: Dawn of Justice' into one trailer? A whole lot of win, that's what.

I can't stop laughing at the part where Charlie sings 'Nightman' over Ben Affleck's mopey Bruce Wayne montage.