Super Cursed Nether Star!!!
Note: Minify the command to avoid issues :)
Birch Ent Boss
Mega Potion (Won't belive what happens)
TROLL SWORD
THE UNKILLABLE CREEPER #1
go 1000mph with a walking stick
TnT
Get cool minecraft banners in ONE COMMAND NO MODS!
Herobrine's Flesh