What’s the scariest ( non violent) sound you’ve heard that’s woken you up in the middle of the night?

Decades ago, when I lived downtown and someone had set the apartment building’s garage on fire. My husband woke up first and one of the neighbors was banging on everyone’s door. We were rushing to get dressed and I grabbed my purse and a photo album.

If it ever happens again (Gawd forbid) I would grab my purse, my phone and my IPad, I think.