The reason this question came up in a game yesterday was the Performance Artist (Core Set 87) ability:
Disrupt : Sacrifice Performance Artist to cancel the effects of a character or support card ability.
Now the question is: Could this ability be used to (temporarily) cancel passive effects?
One example for such a passive effect would be the Chess Prodigy (Summons of the Deep 25) :
When Chess Prodigy commits to a story on your turn, name a struggle type. Resolve that struggle type at that story by counting (I) icons instead of that struggle type's normal icons at that story this phase. The normal struggle effects still apply.
The FAQ indicates that this indeed an effect:
"This type of passive effect that is based on a trigger, will last until the end of the turn when the trigger is met."
So, I think it should be possible to use the Performance Artist's ability to prevent the Chess Prodigy's ability from working.
For an even less clear example consider Alaskan Sledge Dog (Mountains of Madness 16) :
Alaskan Sledge Dog gains a © icon and +1 skill for each card titled Alaskan Sledge Dog in play.
So, could you use Performance Artist to cancel this effect until the end of the turn? Or would this not be possible since there's not even an implicit trigger involved?