Ballade.no is a music information site that is respected and important in its niche(s) over here in Norway. The other day I noticed that apparently nothing happens when you click one of the links below the article summaries that are meant to take you to the complete articles.
This is a small example of the subtlety of some bugs.. Here's the conclusion of the analysis:
When a document.write creates a frameset with more than one frame inside the HEAD part of the document, and is followed by a NOSCRIPT block containing frameset markup, Opera includes the NOSCRIPT-marked code when building the frameset. This duplicates every frame off-screen and thus any link click will load something in an invisible frame instead of the one you are looking at.
Just needs some rhymes and a tune and we have a ballad right here..