Falling into the Hole for the first time.
Levitating into the Hole the first time and having levitate drop.
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Mayong Mistmoore.
The first time someone walked up to a brownie thinking, "oh, how cute!"
The first DT.
Seeing Naggy (or Vox) for the first time, because no dragon like that had ever been seen in a game.
The first soulfire. That effect is STILL great.