Ever notice on this kind of shot how the water droplets betray the size scale? Water droplets the size of a man's head or larger don't work. The surface tension force rises only with the square of the radius, but the disruptive forces mostly rise with the cube of the radius. There is thus a size limit to stability.
A similar thing often happens in shots with flames and/or smoke billows. Individual little candle-flame spikes shouldn't be too big, nor should smoothly curved smoke wisps.
The worst mistake is neglecting to slow the film down when shooting miniatures. If the water flies too fast or the smoke billows too fast, size scale recognition happens at once.