The entire world

Melanie's head struggled to breathe. It was hard to breathe, being an eight-limbed freak with two heads and two opposing sets of genitalia. She thought quickly, "I wish I was a normal person!" "No!" cried Jon's head. Nothing happened. Melanie and Jon were still stuck together into one heaving mass of flesh. "What happened?" said Melanie. "Why haven't we changed?" Jon suspected he knew the answer. "I suggest you go and look outside." The creature lumbered its way over to the window and Melanie looked outside and screamed. Everybody was seemingly a four legged four armed creature with two heads. Melanie was now indeed a normal person because the monster she had turned into was the normality now.