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Another possible source of unexpected extremely loud noises: cleaning things with compressed air. If you blow it through a small orifice of the right dimensions then it can act as a whistle. The energy will be concentrated at one frequency, and compressed air generally blows a lot harder than lung power.

I first heard of this from a Youtube video, possibly from one of AvE's, although it could have been from somebody else's.

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I bought a compressor a couple of years ago, and good grief is that thing noisy.

I always wearing hearing and eye protection when using it, and I'm glad for it. First time I tested the emergency release valve, I didn't know which direction it would release the air. If I hadn't been wearing safety glasses, I could have lost my eyes as it released directly into my face. I now have a rule of not allowing anybody in the workshop with me while using it, if they're not wearing both hearing and eye protection.

Buses with air brakes can cause very loud sudden noises. If they pass right beside you, you can only hope it won't cause any damage.

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