During a speech in Belfast about the importance of young people to the future of peace in Northern Ireland, president Obama delighted the crowd with a traditional Irish phrase.
"What's the craic?" said Obama to the audience, who responded with smiles, laughs and applause.
The President started his address with the remark: "I cause a big fuss wherever I go."
G8 nations have agreed a joint position on Syria at a summit in Northern Ireland, which could pave the way for fresh peace talks in Geneva.
If the body language between Presidents Obama and Putin is anything to go by, this summit has been a disaster.
David Cameron is unlikely to change his stance on backing 'moderate' Syrian rebels but there is genuine uncertainty as to Obama's plans.