John returned to his home after a fairly intense workout. He had forgotten to bring water along, so he went into the fridge and grabbed the first thing he saw and chugged it. As soon as he did, his body instantly transformed into a woman. He didn't know what exactly was in the bottle. His wife must have picked up whatever it was somewhere. He'd just have to wait for her to get home, so he could try to figure out what the heck he drank and (hopefully) how to solve this.