I'm supposed to write a paper on the "real" reason behind not running in the house. It's just why you think you shouldn't run in the house, just something funny nothing real. What should I say is the reason, that will make my class laugh?
I remember when my son was running through the house and ran in to the dining table, hitting his face into the table. Hospital time.
Another time he was running down the stars, and midway as the turned, he slipped and fell. Hosptial time.
He is now a cardiologist, after giving my heart fits as he grew up.
Maybe the "real" reason you shouldn't run in the house because you'd be in competition with the toilet and sink that already have running water.
Or maybe you would scare the resident ghost -- a doddery old man.