You people get deep.
I just use the "impossible" thing to try and spark people into actually asking for things. No matter whether its a consult job, or something in a forum like this, I have a hard time getting them to ask for "impossible" things. I have a hacker attitude that makes it hard for me to put time in on something that just amounts to lots of "doing" and no creative thinking. Ive turned down paying jobs because they couldnt come up with anything challenging.