Sun Mar 17 was St. Patrick's day. The parade was in Omote sando, where they blocked off half of Omote Sando Dori, and lots of Guinness was consumed! The shamrock is one of the symbols for this day. I remember that I used to look for a 4-leaved clover in the school ground for hours and hours. It's said that the 4-leaf clover brings you luck. One even saved Napoleon when he found it on the battle field and as he bent down to pick it, a bullet passed where his head would have been -- or so they say, anyway... Your chance of finding a 4-leaf clover is about 1/100,000, so there certainly is some luck involved in finding one. However, if you can't find one in the fields, you can at least see them in the city -- Alfa Romeo's logo is a "QUADRIFOGLIO" for its sports and racing cars.