Jon looked down at himself and saw that he was in his sister's body! It must have been a body swap that happened.
"What the fuck happened to me?!" he heard his voice yell. He looked up and saw himself standing just a few feet away. The facial expression was pure horror and confusion.
"Zoe, listen to me. It's okay," Jon said. It was so weird hearing Zoe's voice when he was speaking.
"What the fuck did you do to me?" Zoe asked, settling down, but still freaked out.
Jon didn't bother giving her (or was it him now?) an explanation. He (or rather she) reached out and touched Zoe's newly-acquired hand and said "Swap."