A duty you force upon yourself but in fact nobody really cares that much (not trying to sound rude)...which immediately led me to think about Sayonara Zetsubou Sensei! I don't remember which episode # it was.
Different rendering, as a few people have stated. You can actually really easily see this between browsers. There's an image that shows either a green or red apple depending on what browser you use. I don't remember the name of that example anymore.