You know what I would do if I travel back in time and see my younger old self? I would shout at him, and telling he's a stupid boy. Every time I see in retrospective I recall myself being an idiot. That sucks.
(Yeah, paradoxes aplenty, but who cares - I achieved my life's goal: kick my own ass.)
And why did I brought it up right now? I saw a BBS post where I was such a douche that it ashamed me that once upon a time I was that kid.