Why?
It’s an iconic — and intriguing — advertising tagline. MJB Coffee is a San Francisco institution, dating back to 1881 and the same coffee import scene that spawned Folgers Coffee and Hills Bros. Coffee. Twelve of their signs remain in the Bay Area, eleven of which sport the Why? tagline. I've made a new, separate map just showing the locations of the Bay Area's MJB Coffee Co ghost signs. Happy sign hunting and coffee drinking!