A young married couple moves into a new apartment and decides to repaper the dining room....

They call on a neighbor who has a dining room the same size and ask,“How many rolls of wallpaper did you buy when you papered your dining room?”

“Seven,” he says.

So the couple buys seven rolls of expensive paper, and they start papering.

When they get to the end of the fourth roll, the dining room is finished.

Annoyed, they go back to the neighbor and say, “We followed your advice, but we ended up with three extra rolls!”

“So,” he says, “that happened to you too.”