What's the most unexpectedly arousing non-sexual sound or smell you've ever experienced, and what made it hit that way?

The sound of a sewing machine late at night. My wife does tailoring and sometimes she's still at it after dinner. There's something about that rhythmic hum in the silence ..and then it stops, and I hear her stretch and sigh, and she walks into the room smelling like fabric and a little bit of sweat. Nothing perfumed, nothing fancy. Just her. I don't know when that became the most arousing combination to me but here we are. Domesticity hits different when you're actually in love..lol

A woman’s high heels clicking across a marble floor

There's a specific mango-vanilla perfume that my ex had. She only wore it when we were gonna get spicy at night.

The sound of a really good stretch

The smell of fresh sawdust or wood shavings from someone cutting lumber

The smell of after rain and smell of snow They reminds of a girl ik

The smell of a girl I was FWB with. She didn’t smell like sex or p****. She just smelt like her which had me horny for her. Especially smelling her skin. Apparently I have my own smell too according to her and she couldn’t resist it either.