1: Resonance. I love hitting on objects and hearing their tone. It works on everything (I avoid people)... I do it all the time!
2: Formula 1 sounds. I grew up in Monaco, and once a year they have the Grand Prix in the streets. The intensity of all these incredibly power machines racing throughout the city is just indescribable, and it keeps going and going for four days.
Here's a video so you can get an idea:
3: Taxis hooting (honking). I'm in Johannesburg, South Africa at the moment. The taxi drivers hoot at people in the street to pick them up, but also to get other drivers out of the way.
Here's a video, it's insane but not uncommon:
4: The worst music ever and it's drowning everything (including my soul)! I'm sitting at a coffee shop, and if I try to switch off to the music, I can hear: cars. It's not busy streets so it's not like a wash of traffic, each car is distinct; chit-chatting; Cutlery (crockery); A powerful Coffee machine. Massive air con or air vent in the distance.
Here's an audio clip recorded now from my iPhone and posted on audioBoo. Forgive the copyright violation for recording the music. But it's worth hearing how overpowering it is! How I wish the world wouldn't slap on music over everything, especially bad music.