What do you get if you cross a four-leaf clover with poison oak?
A rash of good luck.
What do you get when you cross a pillowcase with a stone?
A Sham Rock.
Why did St Patrick drive all the snakes out of Ireland?
He couldn't afford plane fare.
What do you call an Irishman who keeps bouncing off the walls?
Rick O' Shea.
Why can't you borrow money from a Leprechaun?
Because they're always a little short.
Why should you never iron a four-leaf clover?
You don't want to press your luck.