Wallpaper?

[rebbonk]

Last week, my next door neighbour asked me, "Seeing as our houses are the same design, can I ask how many rolls of wallpaper you bought to decorate the living room?"

"Thirteen," I said.

Today, he came round looking angry. "I've got three rolls left over!"

Spoiler:

"So did I!" I said.

[dutchman]