Final Fantasy VII, Cloud/Zack, blue
This far from Midgar, there's practically no green taint in the sky. Zack scrubs a hand through Cloud's hair and gets pegged in the face for his troubles, but Cloud's laughing too much for there to be too much force behind it. Zack pulls a face anyway, feigning injury, and Cloud smacks him in the shoulder. Not that it'll stop him- when he can get Cloud to laugh at silly things and enjoy the world like someone his age should, why would he?