"The Birthday Present" joke

A man complained to his coworker that he didn't know what to get his wife for her birthday.

"She already has everything you could think of, and she can buy herself whatever she likes."

"Here's an idea," said the colleague. "Make up your own gift certificate that says,' Thirty minutes of great loving, any way you want it.' I guarantee she'll be enchanted."

The next day, Arnold's colleague asked, "Well? Did you take my suggestion?"

"Yes," said Arnold.

"Did she like it?"

"Oh, yes! She jumped up kissed me on the forehead, and ran out of the door yelling,' See you in 30 minutes!'"