Key takeaway
Ireland's unique sense of humour, the art of casual conversation ("the craic"), banter, and social norms that help you fit in.
The Irish sense of humour
Irish humour is distinctive — self-deprecating, quick, often absurdist, and delivered with a straight face. Sarcasm is an art form. A compliment might be delivered as an insult and vice versa. If an Irish person is slagging you (teasing you), it usually means they like you — being ignored is the less kind option. Don't be surprised if someone responds to "how are you?" with a long, deadpan complaint about the weather or their back.
The craic
"Craic" (pronounced "crack") is the most untranslatable Irish word. It covers fun, good conversation, news, gossip, and the general atmosphere of a good time. "What's the craic?" means "what's going on?" or "how are things?". "The craic was mighty" means it was a great night. "Any craic?" means "anything interesting happening?". Understanding this word unlocks a lot of Irish conversation.
The Irish greeting
Irish people rarely answer "how are you?" with a literal answer. Common responses include "grand", "not bad", "sound", or "ah, you know yourself" — all of which mean roughly "fine". "Grand" is probably the most characteristically Irish word — it means okay, acceptable, or fine, often used to avoid elaborating.
Queuing and social rules
The Irish take queuing seriously — cutting in line is considered very rude. Holding a door open for someone is expected. Saying thank you to bus drivers when you get off is common. People tend to be polite in public interactions, though perhaps not as effusively as in some cultures.
Rounds in the pub
If you're out with a group in an Irish pub, the rounds system applies — each person in the group buys a round for everyone. If someone buys you a drink, you're expected to reciprocate. Leaving after someone has bought a round but before you've bought one is considered poor form. It's fine to order a soft drink as part of the round — nobody will comment.
General guidance only. Always verify with official sources — gov.ie, citizensinformation.ie, hse.ie.