Dragon Egg

The Dragon Egg is a block that spawns on top of the Bedrock portal created by the defeat of the Ender Dragon in The End. They currently have no explicit purpose, but are tricky to collect. One of the ways to collect them is to punch a block, then move the cursor over the egg to break it.

Behavior
Clicking on the egg in survival causes it to teleport to a place nearby (up to seven blocks vertically and fifteen blocks horizontally), creating the same particles as Endermen and Nether Portals. It may teleport into the air and subsequently fall to ground.

Like Sand and Gravel, Dragon Eggs fall when unsupported, and if they land in the cube of another block (such as a Torch, Slab or Tall Grass) they will drop as a resource. They cannot suffocate the player by falling onto them.

To obtain the dragon egg, the player may push it with a piston, detonate it with TNT, or place a torch or slab under the block the egg rests on and then destroy that block so the egg falls onto it. It is possible for the player to hit one while it is still moving to the point it breaks, however this is difficult. Another solution, is that you can start breaking a coinciding block and then scroll over to the egg while holding the break button, in this case you will start breaking the egg instead of it teleporting on contact.

History
The Dragon Egg is an item first mentioned by Notch on the 27th of October, 2011 on which Notch was supposedly working before the feature freeze, though it seems to have been worked on during it.

The Dragon Egg was first introduced in Beta 1.9 Pre-release 6 (November 11th 2011).

Trivia

 * Destroying the eggs accompanying Overworld Portal with water or lava will also cause it to drop as a resource.
 * Ender Dragons destroy Dragon Eggs when passing through them.
 * The writer of the Minecraft comic WonderCraft, Samcube, was requested by Mojang to create official Minecraft posters for possible purchase. In part of these works, one can see an area with an Ender Dragon and a chicken on top of a Huge Mushroom. In the same scene is a purple, egg-shaped block like entity near the chicken - this was the Dragon Egg.
 * The achievement “The End.” features a Dragon Egg as its icon. Its icon used to be a Monster Spawner block in the 1.9 pre-releases 3/4/5, due to the lack of Dragon Eggs at this time.
 * When hit with Flint and Steel, a Dragon Egg might break with one hit or teleport and appear in a new position, but still broken.
 * It is one of the few blocks that cannot be obtained through the creative mode inventory.
 * In creative mode, if you obtain an egg as a resource, it is treated as an unlimited block like everything else in your inventory. You can then place multiple Dragon Eggs.
 * in 1.2.5 the Dragon Egg will have dark purple particles emitting from it every so often.