What is hidden in 3D image?

For their anniversary, a couple went out for a romantic dinner. Their teenage daughters said they would fix a dessert and leave it waiting.
When they got home, they saw that the dining room table was beautifully set with china, crystal and candles, and there was a note that read: "Your dessert is in the refrigerator. We are staying with friends, so go ahead and do something we wouldn't do!"
"I suppose," the husband responded dryly, "we could clean the house."