Helping the Railroad lol.

Beat Shaun to death with a sledgehammer when he was already on his death bed.

Angering the whole goodsprings and luring everyone to die to the scorpions

*maniacal laughter* so there was this time when I was a little hungry ...

I let Marcy Long live in Sanctuary.

I also left Synth-Shaun-Kid in the Institute before it detonated.

When I was like 10-13, I would do numerous kill everything play throughs of Fallout New Vegas

I nuked megaton on my first playthrough because I was bored.

Got bored one playthrough and slaughter the entirety of the NCR and Legion (though the latter isn’t evil)

Poisoning Project Purity for President Eden.

Or Blowing up the Citadel, just to get Callahan's Magnum.

I use the brotherhood to take out the institute and railroad then the minutemen to kill the BOS then Nuka world raiders for the minutemen 

Now I expand the raiders to every settlement in the commonwealth thus becoming the most powerful person in Boston because 

War

War Never Changes….

(roll credits)