So out of fun what do you think could be the most sadistic thing SE developers can add into new Dungeons?

I think the incorporation of a Reflect AoE Attack Mechanic on Trash mob may be the most sadistic thing they could add to casual content. It will drive so many people mad and crazy they they can't AoE trash mobs anymore without killing themselves.

(Sorry been playing Shadow Fight 3 and developered a liking to fighting Hard "Casual" level content)