Oh sorry, I didn't see this thread sooner (thank you Reyn

)
Well, this is one of the urban myth things that someone picks up.
Similar to the one that unmarried people cannot kiss in Alabama, and so
on...
Actually, chimney sweeps or Schornsteinfeger, as we call them
are considered "lucky charms" in Germany. It is believed that when
you see or shake hands with a chimney sweep, luck will be on your
side. So a chimney sweep is always a welcome sight.
On New Year we give little charms of four-leaf-clover, and chimney sweep
as a good luck present.
CHIMNEY SWEEP