Some POS toy in the kids playroom has dying batteries and is therefore letting out random "baa's" (come on people, like a sheep).
I can't find it. I didn't even know we had a toy that baa-ed. I've sat quietly in the middle of the room a few times waiting for the terrible sound so I could attack it and shred it to pieces like the wild beast it has turned me into and...nothing!!
(photo from http://www.noahslostark.org/about_us.htm)
So after a few minutes I go on with my life and then, of course, "BAAAAAA"!
I'll find it. And when I do, that thing will wish it had just died quickly and quietly.