The entire ending scene with "light and dark in the universe" has been done by writer Alan Moore in the comic book Top 10 #8 (year 2000).
Michael Harney, who plays Steve Geraci, also played the character 'Steve' in Deadwood. Just like his character here, many of his lines are profanities screamed at the top of his voice. 'You motherf*+#er' in fortissimo is a line delivered frequently and without subtlety, but delivered with style