A wishing well is nothing more that a place to hope and dream. A token offering is given with the silly notion that the wish just might come true. But what happens when these wishes start to come true, on a regular basis?
The PCs traveling along the road/path/trail begin to hear a low droning sound. As they approach they find their path obstructed by hundred of thousands of droning insects. Locusts swarm though the air, feasting on the grass and plants. Passage will be slowed, but the insects pose no threat to the party, aside from being crunchy and disgusting underfoot, climbing into pouches and eating exposed food goods.