I don't know about the Best ever, but it's a good one. My personal favorite is this one:
Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink.
Hide child comments as well
Confirm
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
I don't know about the Best ever, but it's a good one.
My personal favorite is this one: