This is an actual dream I once had. I was with an old Chinese wise man, and he told me I could fly - he showed me I just had to stick out my elbows and flap them up and down (just like in the chicken dance). Once you'd done that a few times, you could just lift up your legs and you'd stay off the ground. He and I were flying around and around in this manner. I was totally amazed that it was possible for people to fly this way. It was so obvious! I thought this is so great a discovery, I can't wait til I wake up and do this for real. It'll change the world. I woke up totally excited and for just a fraction of a second I still believed it, then I guess my waking brain turned something on and I realised, no, that can't work. damn.

So I'd offer: being told that human beings are capable of flying in a way that's completely obvious once you've seen it done.