Big bang...

My kids are in quiet time, which means they are supposed to be playing quietly in their rooms. Suddenly I hear this big bang. I yell down to my boys,
"what was that?"
They don't answer.
I yell again, louder,
"BOYS! WHAT WAS THAT BIG BANG?"
Still no answer.
I run down to their room open their door and ask them again what that big bang was. They look at me and shrug their shoulders.
I go to check on Fenix.
I open the door and it bangs Into something. What the heck...
She had knocked over her doll house, which explained the big bang.
What I still don't understand is how she managed to knock it over onto its back, and how she did so without it landing on her.....