Harmonic functions having no tangential limits

Let ${C_0}$ be a tangential curve in $D = \left\{ {\vert z\vert < 1} \right\}$ which ends at 1 and let ${C_\theta }$ be its rotation about the origin through an angle $\theta$. We construct a bounded harmonic function in $D$ which fails to have limits along ${C_\theta }$ for all $\theta ,0 \leq \theta \leq 2\pi$.