Just a couple of days ago, I was working on a Halloween tablerunner. It was made with three 12-1/2" squares, and the ends were to be triangles so it would be pointy. I'd just bought some $12.99/yard fabric specifically for this table runner, and had bought exactly enough. (I usually don't spend that much if I can help it ... I wait for a sale or a coupon!)
Anyway, I got the three squares sewn together, reached for the triangle end pieces, and they were GONE. I turned this room upside down trying to find them. They're just GONE.
Since that's all of the fabric I had, I couldn't re-cut them, and I didn't have transportation back to the store. I had to finish my tablerunner differently than planned. Grrr!
In the end, it turned out relatively okay, but it sure was frustrating.
And I STILL haven't found those triangle pieces! I figured they'd turn up as soon as the tablerunner was finished, but apparently they sprouted legs and walked right out the door.