How does one switch bodies?

Okay, every who is going to say "Your a lunatic!", or make some crack about reincarnation/Christ, please leave. Especially if it's going to help me. So, my older sister and I were kidding around saying that we wanted to switch bodies with each other, and how much fun it would be and such. So, I went... show more Okay, every who is going to say "Your a lunatic!", or make some crack about reincarnation/Christ, please leave. Especially if it's going to help me. So, my older sister and I were kidding around saying that we wanted to switch bodies with each other, and how much fun it would be and such. So, I went out on the web to research how one would do this, and I found nothing. So, now, I'm curious: how, in theory, do you switch bodies/minds/souls/whatever you switch to end up in the body of your older and willing sister?
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