There are cobbles here in Seattle. Mostly paved over, but some streets have them for a block or so. There’s a right turn straight up from Western, where I expect a commuter is waiting to do a Cancellara. Turning over the gear and just riding away from another cyclist on their way to work will prove most satisfying.
They’ll do it by staying on top of the gear, seated, and with a Body Geometry-type fit; while their competitor throws themselves all over the bike to try and catch up.