I was trying to make minecraft sculptures and art with

mobs, like sethbling did. When I tried to spawn an EnderDragon with NoAI, he just flew away and did what an enderdragon normally does.

No screenshots needed...

Oh and I used

 /summon EnderDragon ~ ~ ~ {NoAI:1}

to spawn him. Seems correct.

EDIT: It doesn't work for LightningBolt too, but maybe that is intended.
And also not for Potions, Items and Arrows...