1. Start a new world in single player with creative mode on.
2. Create a ship with lots of cannon turrets with punch-through effect on.
3. Set god mode for yourself.
4. Spawn in pirate ships that have attached entities and turrets.
5. Attack the pirates with the cannon turret ship.
6. Ensure that some of the attached entities of the pirates are coming off during the attack.
7. Watch as the attached entities become impervious to all types of weapons fire, including cannons and missiles.