You've probably heard the child's cautionary phrase, "Don't let the bedbugs bite!"
While Celtic, German and other European mythologies offer up fairies as cautionary tales, modern literature embraces the array of dark to light by painting the dark, gothic fairies as misunderstood, troubled and layered creations.
These individuals are not concerned about jokes or cautionary tales; they are proud and having a great time rather than covering up and eating nothing but carrot sticks in the hopes of becoming "acceptable".
This flexibility is often used for the development of Cautionary Tales - depictions of life after Peak Oil, or the collapse of civilization attendant upon global warming, perhaps.
One other cautionary note, be careful when giving wine to a business client or associate.