Does Warner Bros. own exclusive movie rights to a story posted on Reddit?

For what it's worth, Reddit's general manager vowed not to interfere in this case <a href="http://www.reddit.com/r/AskReddit/comments/ljf4e/dear_reddit_i_do_not_think_that_ideas_that_are/c2t72e2?context=1" rel="nofollow">http://www.reddit.com/r/AskReddit/comments/ljf4e/dear_reddit...</a>

Took some digging, but as far as I can tell, this is the original Reddit thread in question:<p><a href="http://www.reddit.com/r/AskReddit/comments/k067x/could_i_destroy_the_entire_roman_empire_during/" rel="nofollow">http://www.reddit.com/r/AskReddit/comments/k067x/could_i_des...</a>

What about the guy who actually asked the question? this whole thing emerged in an askreddit thread in which someone asked what would happen if marines went back in time.