As a major IKEA fan (try the Daim chocolate. Go on. It's impossible not to love it.), I have to say that Mark Malkoff is living my dream. This is just brilliant publicity for IKEA, but how many other stores would have said yes to this? (though I can't help wondering if it was really completely Malkoff's idea in the first place. It's just such great publicity!)
I'm not sure spending the night in the library would have the same appeal, but would you say yes if someone wanted to pull a similar stunt in your library? Before you say no to a wild idea, spend some time thinking about why you should say yes. As Seth Godin reminds us, you can't be remarkable without taking risks and trying something new.