Who could have done this?

"Alright, Joan, you've had your fun. Now swap our bodies back," John demanded.

"What makes you think I'm responible for this! How do I know that you didn't do this, and now your accusing me to cover up?"

"Like I'd want to be a subordinate secretary with two huge mounds of flesh on my chest and a void between my legs?"

"As if I'm enjoying being in YUOR body? I feel like a hulking brute! And I'm all hairy and rough! I miss being soft and smooth! But if neither of us is responsible for this, who could have done this to us?"