In the revision history page of an answer, click "edit" next to an old answer, add an edit summary with an apostrophe ('
) or double-quotation-mark ("
) in it, and save without editing the post. The software will append "Rollback to revision [number]" to your edit summary (which is fine) and convert your quotation mark to the corresponding HTML entity displayed on the revisions list (which is a bug).
Example: https://judaism.meta.stackexchange.com/posts/593/revisions