Thunderstorms and rain
The way my orange cat purrs like a buzz saw
My husband's breathing when he's asleep
The deep-down belly laughter of a toddler
A strange sound one of my dogs makes. It starts out as a yawn but then this silly, semi-howl comes out. Cracks me up. Very weird.
The water sound of small fountains
The sound my cats' and dogs' ears make when they shake their heads very quickly. Almost sounds like birds' wings beating, but it's flopping ears.