Mary Siegel was almost crazy with her three young kids.  She complained to her best friend, "They're driving me nuts!!  Such pests.  They give me no rest and I'm half way to the funny farm."

"What you need is a playpen to separate the kids from yourself," her friend said.

So Mary bought a playpen A few days later, her friend called to ask how things were going.

"Superb!  I can't believe it," Mary said. 

"I get in that pen with a good book, a chocolate bar, and the kids don't bother me for hours!"