I suppose all have us have noticed that the tap on the kitchen sink in the Cadiz releases a splurge of water now and again when switched off.
Just been reading on Caravan Talk about the cause and a remedy.
The cause is that a small amount of water remains in the curved tap pipe after the tap is turned off and is held in place by surface tension.
If the surface tension is broken then the water runs out.
The way evidently to get rid of the water intentionally is to place a finger or thumb over the end of the tap ( airtight ) which increase the pressure in the pipe slightly which in turn breaks the surface tension and the water runs out.
I haven't tried it myself but will give it a go when we are next out.