[roughly]

Just remember, you can tune an instrument, but you can’t tuna fish.

[dredmorbius]

<https://en.wikipedia.org/wiki/You_Can_Tune_a_Piano,_but_You_...> (originally by Groucho Marx: <https://ultimateclassicrock.com/kevin-cronin-reo-speedwagon-...>).

Or perhaps more HN-appropriate: <https://unixhistory.livejournal.com/1808.html>.

[saltcured]

Eh, in a discussion about homophones, homonyms, and ambiguity, I prefer the variant, "you can tune a bass, but you can tuna fish".

Right up there with "fruit flies like a banana, but time flies like an arrow".