Shoes are the 1st defense against Leprechauns. They are forced via mythic levels of autism to polish every dirty shoe they see.
If ever you have found yourself in the idiot predicament of having upset one, then shoes will be what saves your life. Running faster will not help you. Firearms will not help you. The unkempt shoe left abandoned in your closet and on your feet will be your only protection from the Irish Ire of the leprechaun.