D2 trivia generation for "quiz"

[Crystalion]

Trivia Question: which unique monsters can swap guard duties?

The game has quite a few places where the player is supposed to quest for a unique item and a Super-unique monster is on-site to guard the treasure. Is there a situation where two such can possibly exchange duties?

Warning: this is answer/discussion of the trivia ...

Yes, at least one that I can think of:
Treehead Woodfist and The Smith can travel to each other's guard post. I can't say I've ever heard of a player going to the trouble, but it would be a fun prank (and easy to set up on a newbie, since they can't get to Dark Wood for some time after starting the game).