When I think about a random idea, I always discourage myself from that idea, saying that this is not possible because blah blah blah or I think I can't just do it etc. Then I figure out that if I keep thinking like this, it would just retard my creativity. I mean, look at today. We have almost everything technology-wise, such as high speed internet, 3D tv and smartphones. I may overlook the past time, when all those things were not imaginable and everyone didn't even think about having all stuff we have right now.
So, why not think like a child? Maybe what we think now, no matter how ridiculous it is, can come into existence in future. Who know? Impossible is nothing, right?
p/s : I'm encouraging myself into fresh and reckless ideas.