And I quote (Irish-style)

Only Irish coffee provides in a single glass all four essential food groups: alcohol, caffeine, sugar, and fat.
- Alex Levine

I thought Irish Coffee was coffe and Irish whisky. Where do the sugar and the fat come in?

Well, I think traditionally it's served with sugar and cream.

Irish Coffee
1 cup hot coffee
1 oz. Irish Whiskey
3 sugar cubes
Whipped cream

In order to make this recipe properly the whiskey has to be heated to a high temperature. Pour the coffee in a cup with the desired number of sugar cubes. Then use a spoon turned upside down and pour the HOT whiskey over it so it flows down gently. Top it all with the whipped cream. See photos below for the process.

When served, true Irish Coffee always has three distinct layers. When served, you first use a straw and sip (a very small amount as it is HOT) a little of the Whiskey. Then stir all the ingredients together.

May the roof above us never fall in.
And may the friends gathered below it never fall out.
- Irish blessing

Always remember to forget
The friends that proved untrue.
But never forget to remember
Those that have stuck by you.
- Irish proverb