When I'm going to boil something, I'll set the water to boil while I prepare the food itself. When the water is boiling and my ingredients are ready, I turn to tip them in. But as I add the pieces of food, the volatile hot water splashes everywhere.  I can prevent this by carefully putting the food in piece by piece so that I only let go when it's not partially in the water. However this is an impractically slow method with lots of pieces to put in.  Besides that slow way, I haven't been able to stop this happening. No matter how much I add at a time, it still splashes because the food is falling in and causing a big disturbance in the surface of the water.   How could I prevent this happening?  
There are a few common techniques:   Use a taller pot. The more height from the water to the top of the pot, the more of the water is contained. Lower the ingredients in with a flexible cutting board. The board flexes into a half-cone over the pot, and allows you to drop the ingredients from a much lower height. Lower the ingredients over a utensil. A spider or slotted spoon make a perfect jumping point for ingredients, reducing how much splash they make. Note that this trick works for pouring sauces into containers (as you reduce the velocity of the molten goods). Drop the temperature. There is less splash-back with water that is less volatile.   