Spoiler for It’s Always Sunny in Philadelphia season 15
So the comedy It’s Always Sunny in Philadelphia is about a group of friends that run an Irish pub in Philadelphia. The character Charlie Kelley throughout the 14 seasons prior has the unanaswered question: who is his father? In season 15 the gang take a trip to Ireland. We learn that Charlie can suddenly speak Irish. This is when Charlie meets his father, played by Colm Meaney.
Correction: Whiskey beer island of green and fight