my friend actually had one about a year ago before it was confinscated. but it was pretty cool. i dont know about freezing it, seeing as glass is such a strange substance when it comes to the extremes of both sides of temperature. though i wouldnt hesitate to put it in the fridge part for maybe 5-10 minutes before smoking though. i mean, you can keep bongs and the such in the fridge or chill them in the freezer to get the water colder if you wanted.

and speaking of that, if you made a bong, and put salt water in it, and then put it in the freezer it wouldnt freeze, it would just get really cold, then you could smoke, i dont think the salt would give the smoke a bad flavor or anything. dont forget the Hot water bong too peoples.