Hands down: "Juanita Suarez" the Molly Malone parody. I went to my partner's family reunion, and we sang it at the "talent show." (This was remarkable because unless there's a bucket handy - or a bottle of irish cream - I can't carry a tune. Bodhran players aren't required to.) Our performance got the most applause. Of course, half of those present were from Iceland and spoke no English, but even so... ;-)