Ms. Teriosa is an abandoned storefront on 24th Street, converted into an interactive art installation for the Art in Storefronts project.
There's a box with cards (sometimes?) you can fill out with questions for the mythical fortune teller Ms. Teriosa, who will someday respond. The responses tend to be witty and delightful, with a good attitude and awareness of the neighborhood - it's worth stopping by to read all of them.
The window at times fills completely with answered queries, but new questions are cycled in periodically, probably every week or two.