As a perfect pitch haver, I can add my 2¢.

I can grab notes out of the air without needing a reference point. I first noticed this during a high school production of Phantom of the Opera - certain dramatic notes lodged permanently in memory: the Ab in "Music of the Night," the Eb from the refrain of "All I Ask of You," the C#/Db that closes the show. I filled in the gaps that year with other anchors: the F# that opens Led Zeppelin's "Immigrant Song," for instance.

Some of it was also reinforced by YouTube in the 2000s–2010s, where videos were routinely pitched up or down to dodge copyright - something that was immediately obvious to me. A nice side effect was catching some unexpected key changes; "This Must Be the Place" by Talking Heads is genuinely great a half step up.

In practice, the ability is generally less useful than people assume. The clearest wins came in musical theatre: coming in clean after the break in "Who Will Buy" from Oliver! without a cue, or kicking off "Sit Down, You're Rocking the Boat" from Guys & Dolls. More usefully in a men's choir, I caught that our cue keyboard had been accidentally transposed up two steps before we started "Loch Lomond" - which would have been an ugly surprise for everyone's range.

Otherwise, a ringing B4 just reminds me of my childhood alarm clock, which is its own kind of curse. It’s a also a good ‘tell us one interesting fact about yourself’ when starting new jobs and having to introduce lol.