The science behind it is that it sounds crunchy because the rock salt draws out the moisture from the music. You will have to replace the salt on a regular basis though - depending on how much music you listen to.
Not only can they be frozen, but when they're frozen and you drop them in coca cola light, they work even better than mentos!
Oh I'm very comfortable with it. In fact I haven't owned a Ubisoft game in many, many years, and I wasn't about to change that.
What if ... the chicken was adopted by a cow?