My actual reaction in the scenario you describe would be to say "Piss off" before I turned around.

But cryonics is a wash as far as taking risks goes. First, nobody is sure it will work, only that it gives you better odds than burial or cremation. Second, suppose you were sure it will work, becoming a fireman looks like a better deal -- die in the line of duty and be immortal anyway. Granted something might happen to destroy your brain instantly, but there's no reason to believe that's more likely than the scenario where you live to be old and your brain disintegrates cell by cell while the doctors prolong your agony as far as they can.