It happened to my house once.
I frankly didn't care. It was kind of cool actually.
My mom did care however. She made me take it all down, which was a huge pain. After that it didn't seem so cool anymore. Things like that aren't funny when it's you that have to clean them up.
So anyways, after I got all the paper down I rolled it up and put it in our bathrooms just to spite the people who did it!
True story.
Not sure why exactly I thought it would help me get even with them, but it seemed like a good idea at the time.