Things that go bump (scrape, scratch, whoooo) in the night:

...all the really old mylar balloons wafting through our house on air currents whenever the heat kicks in. They scrape across the ceiling and make a subtle but definitely noticable scratching sound as they cling to life and I forget to put them out of their misery. Right now we have a round blue Chuck E. Cheese and a red heart that have both seen better days, but they seem to be clinging to the sky so I let them hang out. The heart is from  a party store and has to be going on 2 months old. This shocks me since our latex balloons from the State Fair didn't even survive 24 hours, and some of our Dollar Store mylars only had a few days. Guess that extra $0.99 for the  real deal really makes a difference. Lesson learned.