Adverb
come to think of it
(idiomatic) by the way; now that I think about it; indicates something brought to mind.
Come to think of it, it's curious that nobody was there.
The worst thing about all this staining power of the world is the way in which we come to think of it as inevitable. ... It is not true. ... Social life is lighted up with the lustre of the white, unstained robes of many a pure man or woman who walks through its very midst. Phillips Brooks
Anyway, why would you trust anything written down? She certainly didn't trust "Mothers of Borogravia!" and that was from the government. And if you couldn't trust the government, who could you trust? Very nearly everyone, come to think of it... Terry Pratchett
Misunderstanding is my cornerstone. It's everyone's, come to think of it. Illusions mistaken for truth are the pavement under our feet. Barbara Kingsolver