WATCH: Michael Fassbender chats to Jimmy Fallon about being an altar boy in Killarney
They were both altar boys back in the day - Fallon in Saugerties, New York and Fassbender in Killarney, Co Kerry.
They then wasted no time in sharing their experiences.
Turns out Jimmy was jibbed in his role as Michael revealed he used to get paid from the best man for attending weddings - he was even trusted with the keys of the church!
Wait, all we got was a measly selection box - we feel your pain Jimmy.

