"Why I Fired My Secretary" joke

Two weeks ago, was my forty-fifth birthday, and I wasn't feeling too hot that morning anyway. I went into breakfast, knowing my wife would be pleasant and say Happy Birthday and probably have a present for me. She didn't even say Good Morning, let alone any Happy Birthday. I said, well, that's wives for you. The children will remember. The children came into breakfast and didn't say a word. When I started to the office I was feeling pretty low and despondent.
As I walked into my office, my secretary, Janet said, "Good Morning, Boss, Happy Birthday." And I felt a little better; someone had remembered.
I worked until noon.
About noon Janet knocked on my door and said, "You know it's such a beautiful day outside and it's your birthday, let's go to lunch, just you and me."
I said, "By George, that's the greatest thing I've heard all day. Let's go."
We went to lunch. We didn't go where we normally go; we went out into the country to a little private place. We had two martinis and enjoyed lunch tremendously.
On the way back to the office, she said, "You know, it's such a beautiful day. We don't need to go back to the office. Do we?" I said, "No, I guess not." She said, "Let's go to my apartment."
After arriving at her apartment, we had another martini and smoked a cigarette and she said, "Boss, if you don't mind, I think I'll go into the bedroom and slip into something more comfortable."
"Sure," I excitedly replied.
She went into the bedroom and in about six minutes, she came out. . .
. . . carrying a big birthday cake, followed by my wife and children.
All were singing Happy Birthday.
. . . and there on the couch I sat. . .
. . . with nothing on but my socks. . .