Some arguments in Ireland split households down the centre - Keane or McCarthy; Lyon's or Barry's. But it's rare that a topic of conversation can identify where a person resides.
The eternal question in Irish rugby - O'Gara or Sexton - can be easily used to identify Munster fans from Leinster fans. No selection call in Irish rugby history creates as much debate.
It's generally a deadlock, and one that leaves one certain fence straining under the weight of several thousand pundits unwilling to make that call. I don't even want to disclose my preference publicly.
But Dan Carter? He has balls of steel. We knew that. But in probably the toughest moment of his life on the Anton Savage Show - Carter was asked "Ronan O'Gara or Johnny Sexton?". Carter looked up. Then down. Visualised his answer, before smashing his answer and hoping it goes through the posts.
— Today FM 💛 (@TodayFM) March 10, 2016
That's really tough.
I didn't play a lot against Sexton but for O'Gara to play so many test matches and kick so many points was a great achievement.
There was no politicians answer from old Dan.
But of course, O'Gara is Carter's coach at Racing - so perhaps Dan is a little biased?
I have to pump his confidence. We have been having a lot of kicking sessions and I think I've a mental block on him because I've been killing him.
Given Ireland's record against New Zealand - should that surprise anyone?
Is Carter right?
Picture credit: Matt Browne / SPORTSFILE