A childhood belief about creepy crawlies

When I was little my grandmother told me that if a thousand legged worm saw my teeth that they would all fall out. After I heard that every time I would see a thousand legged worm I would press my lips together and even talk with them curled over my teeth! Finally, they told me that it wasn't true but to this day (out of habit) I still cover my teeth when I see a thousand legged worm.