An Irishman walks into a bar and orders three shots of whiskey.

The bartender asks him why he ordered three shots.
"My life-long friends and I have a tradition. We grew up together but have since gone our separate ways. One is in England and one in the USA, but we each go into a bar on the same day every year and order three shots of whiskey. It's as if we are drinking them together."
He then drinks the shots and leaves the bar. The next couple years, he returns and does the same.
Then, one year the man returns but only orders two shots. He drinks them both.
"I can't help but notice you only ordered two shots," the bartender said. "It appears you must have lost one of your friends. My condolences."
"Oh no," the Irishman said. "Those chaps are doing fine. I just quit drinking, that's all."