There are many kinds of stains in this world. Nearly as many kinds of stains as there are in this mattress. Somehow. Having this in your dwelling will help you to be less squeamish about the various bodily fluids and assorted greasiness you may encounter.
Installing this in your dwelling will destroy your [furniture] -- are you sure you want to proceed?
Yes!
After clicking [Yes!]:
Stained mattress
You toss your [furniture] aside and install the stained mattress in your dwelling. The [furniture] is immediately stolen (and subsequently urinated on) by a hobo. Yech.