The German sign (seen in Bamberg) is ambigious. It can mean “ghost riders, aka cyclists who drive the wrong way on a street, put others at risk”. It can also mean “let’s endanger some ghosts riders”.
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Ghost riders
pictures imperfect blog
imperfect pictures
pictures imperfect blog 
That is a strange one. The sign above looks in shock as well
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That was a bit of editing I admit. The half eyes were there (bicycle tires) but the mouth … I could not resist.
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I liked that little hint of a face
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I’m happy that you see that, too.
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