Minecraft 1.7.4, Minecraft 1.7.5, Minecraft 14w11b, Minecraft 14w18b, Minecraft 14w19a, Minecraft 1.7.10, Minecraft 14w31a, Minecraft 14w32a, Minecraft 14w32b, Minecraft 14w32c, Minecraft 14w32d, Minecraft 14w33a, Minecraft 14w33b, Minecraft 14w33c, Minecraft 14w34d, Minecraft 1.8
Since minecraft updated to 1.7, there was the /summon command. This allowed you to summon projectiles with NBT tags to determine direction and other traits. The wither skull and small fireball projectile are some of these. However, when the command is put in and entered, the wither skull or small fireball will appear for a brief moment, then cease to exist. This does not happen with the arrow or normal fireball.
Steps to reproduce:
1. enter this command: "/summon WitherSkull ~ ~ ~
/summon SmallFireball ~ ~ ~
2.Watch as it disappears.