  Classical-statistical lattice simulations provide a useful approximation to
out-of-equilibrium quantum field theory, but only for systems exhibiting large
occupation numbers, and only for phenomena that are not intrinsically quantum
mechanical in nature. In certain special circumstances, it can be appropriate
to initialize such real-time simulations with quantum-like zero-point
fluctuations. We will revisit these points, and investigate reports that
quantum bubble nucleation rates in 1+1 dimensions can be computed through the
classical evolution of such a quantum-like initial condition. We find that
although intriguing, the reported numerical agreement between
classical-statistical simulations and the quantum nucleation rate in 1+1
dimensions is a coincidence, which is not specific to this choice of
initialisation, is parameter and lattice cut-off dependent and disappears as
the number of space-dimensions increases from 1+1 to 2+1
