  We show that starting from initial conditions with stable perturbations,
evolution of a galileon scalar field results in the appearance of a ghost later
on. To demonstrate this, we consider a theory with k-essence and cubic galileon
Lagrangians on a fixed Minkowski background. Explicit analytical solutions of
simple waves are constructed, on top of which a healthy scalar degree of
freedom is shown to be converted onto a ghost. Such a transformation is smooth
and moreover perturbations remain hyperbolic all the time (until a caustic
forms). We discuss a relation between the ghost and the appearance of closed
causal curves for such solutions.
