why does tiny droplets of water fly off when a wet towel is suddenly jerked?

The water molecules are stationary with respect to the towel and when the towel is given a sudden jerk some of them are forced out. This is because the water molecules possess an inertia of rest and thus have a tendency to stay that way. A sudden jerk in the towel tries to cause motion but due to their inherent inertia water droplets tend to stay at their initial positions and are forced out.