Well of Souls Trap Skin

Too all mice who approach, the wise well will offer them a proposition. "Answer the riddle I propose and all this cheese will be yours to hold!" The trick is that the well acknowledges every answer as correct. As the mice come to collect their prize, they will realize only too late that the bucket and cheesy reward is fake! A super sticky substance shaped into a bucket and cheese that traps the mice that touch it then promptly drops back into the well from where it came.

The wisest one knows that there is no such thing as "free cheese."