This can be presented as a Defense Against the Dark Arts
Lesson, and at the same time can be used to deal with an unruly
heckler who doesn't believe in magic and wizardry and who wants
to take the stage away from you by virtue of his loud voice and
bad manners.
The Wizard induces the heckler to join him on stage, and then
an apprentice brings out a wooden box, presenting him with a
matched pair of dueling wands. The heckler chooses one wand,
leaving the other wand for the Wizard. They stand back to back,
pace away from one another ... three to five paces, depending on
the width of the stage. Then they turn and cast their spells. The
heckler is allowed to go first. However, his wand has become all
wobbly. The Wizard shouts directions to him in a helpful way, but
nothing happens to control the wobbles of the heckler's wand. Now
it is the Wizard's turn, and a fireball issues forth from his
wand to explode on the floor just behind the heckler. "I
missed!" admits the Wizard. "Would you like to try
again? Perhaps I can hit you with a fire bolt this time."
The wise heckler decides to retire to the audience and behave
himself.
