Stephen Colbert may be good at a lot of things but doing an Irish accent isn’t one of them.

The “Late Show”  host asked his guest Paul Mescal how to do a convincing Irish accent, with the “Normal People” star telling him it’s how you pronounce your “As” and your “Rs.”

Mescal gave the example, “Like car, and far,” laughing: “It’s that kind of hard R.”

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After Colbert attempted an accent, Mescal spoke about how the “Normal People” crew helped to make filming the show’s infamous sex scenes much less awkward.

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He also discussed being recognized on a beach in Sydney, and how he’s reacted to the global success of the show.

“The Late Show With Stephen Colbert” airs weeknights at 11:30 p.m. ET/PT on Global.