Firenze, I would normally not turn this into a Shia vs. Sunni issue (I don't delve into those anymore, I don't consider myself as either one), but the last thing I would like is for some non-muslim to see these threads, and think that this is a common muslim practice of sorts.
You should worry abour yourself first, if 'non-Muslim' comes here (it will be out of curiosity) then chances are he will ask too, so lets not get into scenarios. :)