Three Irishmen were sittin' in a bar.
The first says: "Aye, this is a nice bar, but where I come from, there's a better one. At MacDougal's, you buy a drink, you buy another drink, and MacDougal himself will buy your third drink!"
The second then starts: "That sounds like a nice bar, but where I come from, there's a better one called Quinn's. At Quinn's, you buy a drink, Quinn buys you a drink. You buy another drink, Quinn buys you another drink."
Then the third pipes up. "You think that's good? Where I come from, there's this place called Murphy's. At Murphy's, they buy you your first drink, they buy you your second drink, they buy you your third drink, and then, they take you in the back and get you laid!"
"Wow!" say the other two. "That sounds fantastic! Did that actually happen to you?" "No," replies their friend, "but it happened to my sister!"