Old one, not very funny; but VERY Irish:
An Irishman was flustered not being able to find a parking space in a large mall’s parking lot.
“Lord,”he prayed,”I can’t stand this.If you open a space up for me,I swear I’ll give up drinking me whiskey, and I promise to go to church every Sunday.”
Suddenly, the clouds parted and the sun shone on an empty parking spot. Without hesitation, the man said,”Never mind,I found one.”
Good one!