Jim headed them off; "Wait, uh... I can explain, but it'll take some time."

"Go on, Jim, we're listening," Sharon 2 said. "This had better be good," Sharon 1 added. "When I looked up to the heavens just now and said "Thank you" I was of course referring to your safe return to this reality. I admit that I did do an experiment on you, without your knowledge, to increase your breast size. But there was an unexpected side effect. It caused your position in this universe to become unstable, so that you started to randomly flip from one reality to another. A bit like that guy in the TV series "Quantum Leap", except that he only flipped between time periods in the same reality. Whilst you were outside of this - your home - reality, you didn't retain any memory of your time here. Luckily I was able to trace you, and eventually to grab you back to here, but doing that caused you to split in two, as it were."

Jim thought it would be more tactful not to mention the other unintended side effect of his experiment, that the Sharons - and everybody else except for Jim himself - now regarded their nudity as being normal for them. But there was one other thing that he ought to tell them: