I know a little late, but this idea came to me..
The two boys had devoured the turkey, and one of them found a wishbone.
"Hey! Let's see who gets the bigger piece of bone!"
And so they both grabbed onto it, and pulled, and Danny got the bigger piece. He made his wish, and suddenly Josh started to transform.
"I can't believe he changed me into a girl. I hope this change is only temporary, but he won't tell me how long I'm stuck like this"