I am surprised to find 'leprechaun' here, though. I had always been told that it is the Gaelic term 'leath-brógán' (half-shod) and that it refers to the way the wee man usually gets caught: you come upon him unawares as he mends his shoe. You catch him before he slips away, and then you can force him to reveal the whereabouts of his crock of gold.

I have found that gold myself.

OK, let me go, I'll tell you where to look. All is revealed here: http://www.bbc.co.uk/dna/h2g2/brunel/A954759