Summer of 2001.
I'd started an AD&D 2e campaign in Spring of 2000, several months before the rollout of 3e. It was a pseudo-historic game set in a fantasy Earth version of the 3rd Crusade.
As the PC's progressed, they discovered that the Crusades were a worldly reflection of a larger, cosmic war that was threatening to destroy magic and drive all the gods away from Earth, and to save the world they had to travel the world and eventually other planes of existence to gather artifacts needed to drive off the forces of destruction and oblivion that sought to turn their fantastic magical Earth into a mostly-mundane Earth (where only the only deity would be the Babylonian Goddess of Primordial Chaos, Tiamat herself, and she would rule quietly from the shadows, in a world filled with hatred and cynicism that would see magic fade away slowly to a memory and eventually a myth that nobody believes ever really happened).
So, in a climactic battle in the ruins of Atlantis against Tiamat the PC's manage to activate an ancient Atlantean relic that preserved magic and let the PC's drive Tiamat back to the Planes.
As Tiamat was banished and the relic continued to activate the world began to fade to white. . .
I asked each PC to make a Saving Throw to not take some HP damage from the powerful magical energies that were being released right in front of them . . .and asked them to roll high.
Every player got a knowing look on their face, including a sigh from the 2e grognard amongst us. The world switched over to 3e at the end of the campaign and that was the last time our group ever played AD&D 2e.