The plastic frog that holds your kid's bath toys falling off the wall & crashing into the tub.
Yup, 1 am and it sounded as though someone tried to break down our front door to rob us. Rich did some crazy sort of Matrix-esque move over me and out of bed, straight down the hall. Cook ran into the living room barking and I bolted looking for the phone.
After we realized no one was trying to break in, I looked in the bath tub to see this.
So I left it and went back to bed.