and so on? thats probably it.
Okay...
Complete I Put A Spell On You for Legion.
Side with the Omerta's.
Serve Veronica, Boone, Cassidy or Arcade as food to White Glove Society.
Turn White Glove Society into cannibals.
Let Keene have the Stealthboy MK II.
Do Jack's quest but tell his girlfriend to be that the Boomers are already expecting her when they are in fact, not.
[censored] over Keeley don in Vault 22.
Don't help the Vault 34 Survivors and give the water to Sharecroppers instead.
Don't do any Followers quests.
Turn Helios One into a weapon.
Kill all officials in Forlorn Hope for Dead Sea. (not adviced though)
Have Hanlon kill himself.
Say hello to the Misfits but don't help them.
When collecting money for Atomic Wrangler, be rough with the ones who need to pay up.
Heat up the feud between The Kings and NCR.
That ugly ghoul in Freeside, make fun of him.
Do the Van Graffs quest-line.
Help Vault 19 Powder Gangers.
Silently steal the Lonesome Drifters guitar for fun.
Charm Benny and silently assassinate him.
Steal from people.
Cannibalize.
Do the Crimson Caravan jobs, but do them evil'y.
And probably lots more.