Report a typo, and then reply to your own report. As a footnote to the typo-report, you would ask people to downvote the report so it became hidden, and upvote the daughter-post as a karma-balance.

e.g.

Larks:

You spelt ### wrong.

NB: could everyone please downvote this post so it becomes hidden, and upvote the post below as a karma-balance. If you would like to express disaproval of this post, simply omit to upvote the balance.

Larks:

Karma Balance