So now that activity in this thread has died off, time to reveal that I've been doing a different thought experiment than the rest of you.

Having decided that I wouldn't go back to my own past if I could, I asked this question and have been deciding, based on the responses, who I would send back into their own past if I could. I've come up with a grand total of 3 people I'd send back. Most of your responses have been disappointingly glib.

Who do you think the 3 are?