We started playing in the early 90s and completely played the Jaiman Kier campaign over a period of over 15 years. We played with two groups; one every thursday and one every other Saturday. This resulted in multiple intertwined story lines. One of the greatest moments was when one of the PCs attuned the access orb in the tower of the third moon with a roll of 497. Those are the rolls that mess up a GMs story line. In this case I decided that he'd broadcasted his presence to all who have an orb. He was an arch mage, which are pretty rare, so he'd get offers to join several groups. The player instantly decided to go with Sulton Ni'Shaang because he promised him "power beyond imagining". So much for loyalty. Later in a different story line he picked up the Scepter of the god-king (Demons of the burning night) confessed all his sins and helped the Kier party to steal the crown from his former boss. Karma.
Week x Player decides his character joins the dark side.
Week x + 1: New character: player comes out of the sewer, wants to run through a house and is stopped by a little lady that says: "you are not getting
doodoo on my clean floor". PC: I attack her with my sword, rolls a 99 on the crit stabbing her in the eye, killing her instantly. He's later arrested and hanged.
Week x + 2: New character. On a random encounter the party meets an Olthoi. It's hungry and decides to eat the PCs horse. Player:"I use my cloak of flying, land on it and stab it". GM: "Are you sure? It's an airborne jellyfish, 30meters in diameter and has 10meter tentacles. It's frigging huge". Player: "I attack". GM: "you do 10 hits. it notices you, cast paralysis on you and thinks: ah desert!". Other player: "Let's run while it eats him and his horse".
One off player: In RL he's big and loud and boasting and his character has to be even bigger, even louder and even more boasting; way over the obnoxious line. The PC is called "white mountain" and he has to be front and center in every fight, has to get the best loot, has to hoard all the attention. And when they have fought through the dungeon, he has to be the one that wakes up the paladin fulfilling the prophesy. It turns out the paladin is actually an anti paladin. He graciously thanks the party for waking him up and teleports away. The look on the braggarts face: priceless. I can't remember what source book that was in, but it was awesome.
PC: "I'm the windblade, I'm the windblade, I'm the windblade...what a stupid sword. Let's throw it off a cliff" GM:"nonononono"
You have given me and my friends some of the best memories. Thank you