Cooking pasta in a water boiler
Advantages:


You can make pasta in your water boiler.


Disadvantages:


Hard to clean. 
Waste of energy, a water boiler is on or off, it will
expend full energy keeping the water boiling.
Incredibly dangerous, a big fire hazard. Because it's modified to ignore the internal temperature sensor it will keep heating and
heating even if all the water is vaporized. Once this is the case, it
will start getting so hot it will melt the boiler and the metal of
the heating element at which point your stovetop may catch fire.


Story about faulty kettle.