A new story is frequently being whispered in the dark corners of taverns across the country, telling of a traveler that occasionally appears in quiet, rural towns; that draws with him a plague worse than any other: a dragon's wrath.
The PCs come across a wild thicket of luscious looking blackberries. They eat the berries and become drunken fools. Later they find out that the berries were part of a fae garden and were intended for fae wine. In payment for stealing the berries, the mischievious fae make life inconvenient for the PCs. Horses are untied, water skins are drained, spare clothing is drug into the water, etc.