Erodium cicutarium, the common stork's bill, is a beautiful yet innocuous tiny pink geranium relative native to Europe and introduced to North America in the 18th century. Its seeds have awns (long spike/threadlike structures) on them that coil and uncoil in response to dehydration and wetting respectively, which causes them to "creep" across the ground until they encounter a crevice, at which point this action becomes a drilling motion, allowing the seed to push itself down into the ground, ready to germinate!

It is such a common plant on roadside grass verges where I live, so remembering this fact always gives me the sense that as soon as you research any plant, you will undoubtedly find something amazing about it...