You can boil water in a condom, ziplock, paper cup etc. The material will not burn until the it has boiled dry. I haven't tryed using a condom or a ziplock, although I have heated the condom with a flame, just not to boiling point. I am not sure if it would be sensible to tie up the top of the condom as the pressure might break it.
Not really practical, just some fun suggestions <img src="images/graemlins/laugh.gif" alt="" />