There are a lot of dopey, uninspired mashups out there, but what Albert Lopez has done is very rare; he managed to make a funny, well-edited recut of the Batman v Superman trailer, matching it up with the infamous "Dayman" song from It's Always Sunny in Philadelphia -- that also completely matches up with the central characters of the movie. It's kind of hard to believe nobody has made the Dayman/Superman Nightman/Batman comparison before, so it's likely already been done, but definitely not this well. Good luck getting this song out of your head for the rest of the day.