When a cricket whistles on the hob it is a sign of great misfortune. If you interfere with a [fairy] fort bad luck will approach you. When a robin is near your back door it is considered a good omen.

The fairies are said to guard the numerous fairy forts, and disturbing or interfering with them could bring bad luck or ...

to ask for blessings and good luck Bad luck caused by disturbed fairy forts is causing dips in a major road between County Kerry and County Cork, an Irish member of parliament has said.