i was alone one time and i started to hear something coming from upstairs...well here I figured out (from downstairs...im not that crazy girl who goes looking for danger!!) that it was my sisters toy that turned on...weird huh....so i went back to the couch and tried to hold my fear in and then all of a sudden every single smoke detector went off in house! they all just started beeping like mad and I ran out the front door in the yard and refused to go back inside until someone came home lol...thank God they were only on a walk....true story...freaked the crap outta me roflmao..