Unsolved Mysteries

This afternoon as I was making dinner, I heard a loud, clanging CRASH! as something in the other room hit the floor. 

Me:  Naomi!  Hannah!  What was that?

N & H:  What?

Me:  That loud crashing noise that I just heard from out there.  What happened?  Did something fall?

N:  I don’t know.

H:  I don’t know.

I was at a crucial point in my cooking, so I couldn’t go investigate right away.

Me:  Well, please look around and see if you can see what might have fallen. 

H:  I can’t see anything that made a crashing noise.

Me:  Okay.

Since Sim was in the kitchen with me and the other two were clearly not hurt, I didn’t pursue it further.

However, when I walked into the living room, there was the folding kitchen stool, clearly fallen over in the middle of the room.  Since this is not where we keep the folding kitchen stool, and since it’s made of metal, I suddenly had a good clue as to what made the crashing noise.

Now I had to figure out the real mystery:  How did both Hannah and Naomi both miss that clue?

Upon asking, Naomi said, “Oh, that might have fallen over when I jumped off of it.”

At which point, I decided that some mysteries didn’t need to be solved.  Namely, WHY Naomi jumping off the kitchen stool in the living room…