We have a ceiling air vent and my friends were over at my house having a sleepover and sometime during then my dad came down and found it on the ground broken. Everyone said they don't know how it got there. I know my friends didn't touch it but today my dad told me he was 100% sure they touched it but they aren't even tall enough to do that. I am certain they didn't touch it. Anyways, they came over again today and it was a little loose. That bathroom is only really used when they come over but I'm certain they didn't touch it. What could have happened if they didn't touch it? I couldn't get a picture but it is round.