Affects Version/s: Minecraft 13w39b, Minecraft 1.8, Minecraft 1.8.1-pre3, Minecraft 1.8.1, Minecraft 1.8.2-pre1, Minecraft 1.8.8, Minecraft 15w35b, Minecraft 15w35e
Fix Version/s: Minecraft 15w49a
If you have a Villager get attacked by a Baby Zombie in Hard mode, it could rarely turn into a Baby Zombie Villager.
Step 1: Spawn or find a Villager
Step 2: Spawn a Baby Zombie near the Villager
Step 3: Have it turn into a Zombie
NOTICE: This rarely happens, so you have keep trying to do it