creeper!
Note: Minify the command to avoid issues :)
Notch has added a new mob to minecraft:NUCLEAR CREEPER!!!!!!!!!!!!!!!!!
Weak Creeper
WTF?!?!?!?!
Griefing Items in 1 command 1.8.7 (Read the comments!)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)