One time, as a kid, I found a ball totally covered by dust. Elated, I promised all my friends that I had a ball we could play over the weekend. 

On that fateful Saturday, however, I was met with a surprise. I made my way to the place I found the ball. When I picked it up, it crumbled to dust in my hands. 

It turned out that what I had found, was only a mold of dust. My dream of a fun time literally crumbled. 

That was the first and last time I had a dream based on assumption. Nowadays, I first check how concrete and then I cast my imaginations.