Gots t' know? I remember that scene. And Harry calmly cocked the gun, pointed it at the perp's head and pulled the trigger. Great. Now the guy knows, and he has the added bonus of an uncomfortable lump in the back of his now-soaked underwear.
However, at least there was a way of knowing the "answer" for him. The only way you can knowing the answer is to contact Doc and get in the DeLorean. Make sure you hit 86mph. See? This is a largely worthless expenditure of mental and emotional energy. You can't go back in time and try it the other way.
Oh...but maybe you have a surplus of mental and emotional energy. Yeah, that sounds likely since you haven't eaten since April and you're dealing with a philandering spouse, and you're staying up late looking through your keylogger files and her text messages, and you're trying to figure out your finances, and your daughter's watch cost WAY too much, and the OM is one ugly mofo, and I need to post on the ssm board, and....
Choc - focus on the task at hand. Be the hero of your family. Super Choc.