What you'll need:
Night
Music box
Full moon
Empty room
Step one:
Be sure the room is empty of people,it's night and a full moon is out.
Step two:
Wind up the music box,let it play and chant:
"1,2,
Grossman's coming for you.
3,4,
you better not forget.
5,6,
you better show some respect.
7,8,
Don't make faces.
9,10,
Don't ever forget your friend Laughing Jack!"