The part that repeals Prohibition.
The "one" and only US Constitution (in its entirety).
Ninth Amendment: declares that the listing of individual rights in the Constitution and Bill of Rights is not meant to be comprehensive; and that the other rights not specifically mentioned are retained by the people.
Free speech. I really wish we would have kept that one. Hate speech laws and the behaviour of the citizens (hounding out minority views as seen at a2k for instance ) is proof that we have lost this right.