My 2 cents again :
The classic iconic anthology moments of dungeoneering

:
a)The moment the party is in front of the dungeon.. Like when at LotR movie I they are in front of Moria..
OR
b) the moment the party/hero enters the dungeon and the exit collapses behind him, like Eye of The Beholder 1 I think, Ultima Underworld 1, I'm sure many other games and movies should have similar scenes
also
c) a moment of adventuring of the party, where they're looking at a wall and standing aside one of them touches a brick or something with a 10 feet pole

Always good for traps and very iconic again..
plus
d) an encounter moment but that has been done so much since many games/ds releases have for cover the "monster"/enemy in front of the player character..
and finalyl
e) the moment of treasure at the end, where a room full of riches or/and liches dazzles the heroes and the player/listener.. Also iconic and I think also much done..
Of course you could think of other classic scenarios to draw, like the death of the party to an enemy or a trap, or maybe something out of the ordinary completely like a surreal dungeon or something which maybe has also been done but still ..