That game had some great (semi-hidden) sound clips:
Pause the game for ~20m:

"The very rock yawns in anticipation of your next fascinating move"

Play past midnight, 1am, 2am (etc) got you a little nagging:

"Surely even dungeon keepers must retire to a lair of some description?"
"You know that low, broad, downy-soft item of furniture in the next room? It has the power to cure fatigue and restore vitality"
"Hello? Are you still there? The Imps are about to lock up."
"Your nocturnal perseverance has earned you a hidden gaming tip: Go to bed!"

Edit: And then there's general silliness:

"A lost soul has entered your dungeon. Oh – no, it’s wandered out again"
"Your dungeon floor is lumpy. Order your minions to jump up and down"
"Hungry Demons cannot reach their toes"
"Your dungeon is on an incline. Angry creatures cannot play marbles"
"Your dungeon is full of yoghurt"
"Micro-piglets stalk your dungeon. Beware!"
"Your dungeon is damp. Install central heating"
"Your minions demand cable"
"One of your imps does a great impression of you. He can even do the ears"

A fuller list found here: www.keeperklan.com/threads/890-How-to-get-silly-mentor-quotes
(The Incredible Sulk Finally remembered his password on, Thu 4 Nov 2010, 17:18, Reply)