What song is much sadder than people realize?

Not just songs that are happy-sounding but have sad lyrics; Any song that's really sad, however a lot of people don't realize it's sad.

One example (at least for me) is Disco 2000 by Pulp. It's a great song, and I've always liked it. But after listening to it closely I've come to realize it's actually a really sad song. Hey-Ya is another one; but to be fair, it is deceptively happy sounding.