Most memorable co-op/pvp moment

This is kinda both for me. Man, I'll never forget that day, best experience of my life.

So there I am, my first ever character on the 360. I decide, "Hey, why not?" So I lay down my summon sign at Anor Londo, in front of the church entrance. This guy summons me, then another phantom and guys... might as well have been NPCs super OP. We got invaded, but no we didn't gank. We took turns terrorizing these people-err I mean.. dueling. 3 hours went by before I got tired and decided to call it a night. Not once did we gank. We would even let them pick their challenger! It was amazing, and I probably won't ever have another PVP experience like that again.

mine was with the four king, I summoned two cool phantoms, and we totally obliterated the kings, we would regroup after vanquishing one of them and do cool gestures and bite the green blossoms. it was amazing

But my favorite has to be in demon souls, I have invaded some guys who might be new to the game, one of them, i could tell was really scared cuz I invaded just when he trapped by patches, he didn't attack out of fear and I trusted my halberd in the direction of the phantom who gives you the magic sowrd makoto, after that, I helped him for all the level, killing everything for him until the boss fog door, I bowed and let him enter to the boss room! :3