I want to point out, that when Batman and Superman fight again  because IDK. Superman gets a haircut or something:

[youtube]https://www.youtube.com/watch?v=maX-ObiJB3o[/youtube] this is how it needs to go down.

ALSO THERES A THOUGHT. If all of Superman is invulnerable cause Yellow Sun. How does he cut his hair/shave/cut his nails?