When someone gets a new car it is custom to give them money.
Don't ever get married in May.
Mead wine is served, warm, at weddings. Usually the wedding cake is a lot like Christmas fruit cake. It almost always has fruit.
If a fork falls off the table a woman is coming to visit; a knife means a man.
When you have an itchy nose you should playfully hit everyone you are with and say "itchy nose" to insure you won't get into a fight with them.
Instead of playing "Punch Buggy" Where American's say "Punch buggy [colour of the Volkswagen Beetle that they see on the road], no punch backs!" Irish people say "Yellow registration, no returns". Yellow registrations are a type of license plate on cars in the United Kingdom and every so often you see one in the Republic of Ireland that are from Northern Ireland.
When there is an electrical storm, you should cover all the mirrors in the house or turn them around.
Your 21st birthday is the most important birthday. It is when you are considered an adult and it is a tradition to be given "the key to the house". Some 21st birthday cards still have keys on them as the symbol.
Irish dancers must wear their hair in curls.
On St. Stephen's Day, the 26th of December which is known to the English as Boxing Day, Irish children dress up and go door to door singing and performing. Sometimes they are given money, cookies, cake, tea, oranges, or nothing at all.
Also, common things that of as Irish but really are not: -Corned beef -Kissing the Blarney Stone (mainly a tourist attraction).Have a fun day!