squeak!

Tonight I arrived home after a lovely day with Biff to hear a strange squeaking sound. I stopped in my tracks fearing what it could be. Was a bird trapped in my home somewhere, perhaps injured from cat but still alive? Was a neighbor having fun by squeaking outside my window?
Naaaah, it was my smoke detector. The battery was dead. I don't know if any of you saw that episode of Friends when Phoebe hears the same noise and takes the battery out of hers and the noise continues, but I put another battery in and it still squeaked.
Anyhoo, better not light any candles til I get some new batteries.