PHARAOH'S SNAKE (SUGAR + SULFURID ACID)
NEEDED

     -  Sugar
     -  conc. sulfuric acid : H2SO4
     -  Fume hood or outdoors (poisonous smoke!)

PROCEDURE

         A high 500 ml glas beaker is filled half with
     sugar, about 3 cm of conc. H2SO4 (eeehm, take
     care!) are added and everything is intermixed
     with a solid stick (big spatula, ...). As soon as the
     mixture turns dark take some distance. A fat
     black "snake" comes out of the beaker. The
     smoke is toxic sulfur oxide.

COMMENTS

         The waste is basically coal and can be
     disposed without worriess. HOWEVER, there
     will be residual drops of concentrated sulfuric
     acid. so do not touch anything with your bare
     hands and also make sure, that nobody else
     does - do not let it stand around (e.g. to let it
     cool down) since passersby will not be aware of
     the danger and might touch it out of curiosity.
The snake :-)