Regarding the rugby version referenced (eek) 19 years ago, the correct lyric is:

Who beat the All Blacks?
Who beat the All Blacks?
Who beat the All Blacks?
Good old Sospan fach

This refers to Llanelli's (aka 'The Sospans') win over the touring New Zealanders in 1972. My Dad (though a Merthyr man) used to take me to watch Llanelli for their Boxing Day fixture when we were down in Wales for Christmas. Back in the day most of the stars of that great early 70s Welsh team played for Llanelli. And I believe that the saucepans that used to sit on top of the posts at Stradey Park are still there in the Scarlets' new ground. Good luck to them in Dublin on Saturday!