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Dial Tone
(lemm.ee)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Sorry to nitpick... Tinnitus is more likely to introduce high-frequency sound than the 440Hz dial tone. If anything, that is the one frequency that old-timey phone techs would eventually struggle to hear...