BRC: Why didn't Captain Picard have Samuel Clemens sign some books?
Me (half-asleep): What on earth are you talking about?
BRC: That Star Trek episode where Picard went back in time and met Samuel Clemens. He should have had Clemens sign his books.
Me (sleepily): He didn't do it because that would have violated the Prime Directive.
BRC: But he would have made a sh!!load of money!
Me: Just go to sleep, dear.