Dogs growling and kitties hissing
Silverware scratching on a plate
Biggest bad noise is an unusual hummming or squeaking as you are driving along ,alone out on a quiet highway, the sound of a car with a problem, ....shudder
The squeak of running shoes on a floor. The sound of my dog licking - my husband loves having his feet licked and drives me nuts! The sound of someone sniffing - for goodness sake use a kleenex! Dripping faucets and mosquitos.
...that snapping, cracking, popping sound that some people make when they chew gum.