It's a bit difficult to talk about urban myths when you've lived in rural Ireland for fifteen years, other than to recall them, but I wonder if some of the practices we discovered around here have their counterparts elsewhere.
All the houses around here stand alone, other than those on the main street in town.
The older generation have told us that you should always leave a house from the same door you entered it - never come in the front door and leave at the back, otherwise you will take the luck of the house away with you.
When we had this house built we were told by the builder that our elderly neighbour had insisted on placing four two-shilling pieces in the stonework at each corner of the building (for luck).   
We were told that, if we wanted good luck, we should always move an item of furniture into the house on the Thursday before we moved in.
Shortly after we moved in a neighbour presented us with a paper bag containing a clove of wild garlic, a potato and a coin, wishing us 'health, sustenance and prosperity' thoughout our time here.   
Interesting place and nice people
Jim Carroll