Will Ferrell

So I ran across this blog about Will Ferrell exploring things that never where made but that we had, in a way, been promised. I remember watching Jetsons or Back to the Future and thinking how awesome it was gonna be when I got my own jet pack or flying car or what not. But, it hasn't happened yet... It's 2010 people where is my jet pack? Design sometimes offers things that aren't technologically plausible yet... Is design mostly imagination?