I've always wished I had synesthesia. There are a couple of sounds I have found to make me physically feel something, but I think that mostly has to do with learned associations at this point. It's really only a couple of sounds that do it, and it is not really consistent enough to be synesthesia.

That being said, roughly a third of my friends have synesthesia for some weird reason. I have one friend that sounds create smell or taste for him (I can't remember which). I have another friend who sees shapes and colors when he tastes things. A good number of my friends see shapes and colors when they hear sounds; a couple of those people have developed perfect pitch because of it. A good number of my friends have the grapheme-color synesthesia where letters and numbers have specific colors (and genders and basic personalities actually...) I believe one friend has spatial sequence synesthesia. I have always found the topic fascinating.