Sometimes, when walking in the forest, I see a plant that looks out of place in The Netherlands, or indeed anywhere. It just doesn't fit in with the rest:
Olympus Stylus 1s, 42mm, ISO200, f5.6, 1/160s
It is a fertile stem of a plant called field horsetail (Equisetum arvense). It could just be my imagination, but the little flowers look like miniature dentures to me:
Olympus XZ-1, 28mm, ISO100, f5.6, 1/160s
Expanding on @nin0000's comment and stealing from Wikipedia; it's also an ancient plant:
"Equisetum is a "living fossil" as it is the only living genus of the entire class Equisetopsida, which for over one hundred million years was much more diverse and dominated the understory of late Paleozoic forests. Some Equisetopsida were large trees reaching to 30 meters tall. The genus Calamites of the family Calamitaceae, for example, is abundant in coal deposits from the Carboniferous period."
All in all, a really strange plant, very interesting, but a pain to get rid of when it has invaded your garden.