Hemlock comes to mind, as with or without your proffered grain of salt, it can be eaten but is definitely not edible. Those defs are posted in a non-pedantic way above, incidentally.
Also, thanks for the chance to use the word ‘proffered’ in conversation, it’s vanishingly rarely used outside the legal field.
I’ll go one farther - unless it’s my doc, my wife, or my boss, I’m neither answering the call nor listening to the voicemail. That’s what easily skimmable voicemail transcription is for…
I don’t love the privacy implications of transcribed voicemail, ofc, but it’s better for my own privacy/threat model than answering the phone to robots, scammers, and etc. It’s also a hell of a lot better for my mental health, vs listening to them.