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1.
This isn't luck at all, but more of an attitiude, a positive look at a bad situation.

The Irish didn't survive a potato famine, and being treated as 3rd class citizens upon their arrival to the U.S. (til the mid-late 1900's)by not having a positive outlook and a great sense of humor!
Mary-"I was just wearing my new shoes today when I stepped in a HUGE cow shit"

Michael-"Well then, tis a LUCKY thing you were wearing shoes!"

Mary-"Yea, Luck of the Irish"
by Eileen F. March 09, 2008
 
2.
Bad luck... People think the irish are lucky. They are wrong.
The Irish drink because they are cursed with the luck of the irish.
by Michael McD March 15, 2008