John brought his new work colleague, Robert, home for dinner.

As they arrived at the door, his wife rushed up, threw her arms around John and kissed him passionately.

“Wow!” said Robert. “And how long have you two been married?”

“Twenty-four years,” replied John.

“You must have a terrific marriage if your wife greets you like that after all those years.”

“Don’t be fooled,” said John.

“She only does it to make the dog jealous.”