Convincing ?

Try to think of times when someone has convinced you of something.

It is oddly hard. I think a key reason is that we change our minds when we are not thinking about an issue. I read decades ago the report by I don't know who that he regularly noticed that his opinions on eg slippery slope arguments had changed, but that they never changed when he was thinking about the issue let alone discussing it.

I bring this up, because I was wondering if Charles Krauthammer has ever convinced anyone of anything.

Please report cases of being convinced in comments.