For several years, a man was having an affair with an Italian woman.  

One night, she confided in him that she was pregnant.

Not wanting to ruin his reputation or his marriage, he told her he'd pay her a large sum of money if she'd return to Italy to have the child.

If she'd stay in Italy and raise the child, he would also provide child support until the child turned 18.

She agreed, but asked him how she'd notify him once she'd given birth.

To  keep it discreet, he told her to simply mail him a post card, and write
"Spaghetti" on the back. He'd then arrange for the child support payments to begin.

About 9 months later, he came home one day to his very confused wife.

"Honey," she said, "you received a very strange post card today."

"Really he said, let me have a look?" 

The wife gave him the card watching his face as he turned white, and fainted.

On the card was written:
"Spaghetti, Spaghetti, Spaghetti, Spaghetti, Spaghetti. Three with meatballs, two without.  Send extra sauce."