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Certainly, this is the long way around to communicate Danger (or how should the sign read?). It's rather unconventional--even motherly in tone--but I suppose it's correct. When I encountered the sign (at Põltsamaa castle) I stood in front of it for several minutes, recalling all the warnings my mother gave me as a child. You're liable to lose an eye. You're liable to kill your brother. But she never said I was liable to have a castle fall on me.
So I sent the photo to my mother, who replied that her warnings had indeed managed to keep me alive this long. If your mother told you the same silly things, feel free to send her this image. And let me know what she says.