I only play this for my Mum now. But, yes, everyone should know it. The only problem is that, because everyone knows it, they will all hear any mistakes made.
well, even if it's "fur elise", or "marca alla turca", or "fantasie impromptu", etc etc, those well known pieces, you can play them bad, or you can play them really good with lots of feelings. You can sometimes even hear the difference when, say, "fur elise" is played by Horowitz for example, although I doubt you can find him playing that. :-)Even so, it's possible to see other prominent pianists who've played any of them.... like mp3s online...