I only pierce eggs I'm soft boiling, because they'll be eaten right away. I pierce the the fat end with a short tack, because that's where the air pocket is and no contents leaks out. I never pierce hard boiled eggs, because the shell protects the contents before the eggs are eaten. Also, I sprinkle salt over the eggs in the water before turning on the heat, because if an egg cracks open, the salt prevents a big mess in the pot.
I only pierce eggs I'm soft boiling, because they'll be eaten right away. I pierce the the fat end with a short tack, because that's where the air pocket is and no contents leaks out. I never pierce hard boiled eggs, because the shell protects the contents before the eggs are eaten. Also, I sprinkle salt over the eggs in the water before turning on the heat, because if an egg cracks open, the salt prevents a big mess in the pot.