One Word
A Severus Snape Fanfiction
If it wasn't for Sirius Black and James Potter he never would have said it. That one day during his fifth year, that one word. He called Lily that horrible name, ruining the rest of their lives. That is the word that ended their friendship and started a new one. He should have made it right. Then none of those horrible things would have happened. She may never have married James. Then Harry wouldn't even be born and Lily and James wouldn't have died. Severus would never have become a Death Eater. They could've fought against Voldemort together.
The bad part is the prophecy could have meant Neville and Voldemort would never have given his parents the chance to save themselves and Neville would've died. Then the prophecy might not have been fulfilled. Of course, that could have made it possible for any of the Order members to kill him.
It is amazing how one word can change so many futures. How one person can change the world. The wizarding world could have been better off. But everything changed with one word: Mudblood.