Who would it be, how long would you spend with them and why?
I would spend every waking minute training under Bruce Lee learning everything possible from his mastery of the martial arts. Why? I mean, who doesn't want to know how to kick chuck norris' ass?
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My past self so I could punch him for being such a jerk.
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Either Aleister Crowley or Jack the Ripper. I had a few others in mind, but I don't remember them at the moment.