How do I keep an egg from cracking while being boiled?
I see two possible solutions here:


Very slowly increase the temperature of the water. This way, the
water currents will be much tamer, and the egg is much less likely to
move around.
You could also try either cooking the egg in a heat-resistant spoon to minimize its movement, or fill the pot with many eggs, so they have less room to move around and gently bump each other rather than the walls of the pot.