Michelle & Barack Obama Chug Through Ireland

5/23/2011 2:00 PM PDT BY Johnny Lopez
First Lady Michelle Obama and President Barack Obama engaged in some high priority business while in Ireland on Monday ... downing pints of Guinness at a pub.


The Prez visited the Irish town of Moneygall -- the home of his great-great-great grandfather. 

After leading the bar in a toast ... the president plunked down some cash and told the bar tender, "I just want you to know that the President pays his bar tab ... that's how we do things."

Hopefully, he left a good tip.