The Bodhisatta was once a very skilled acrobat und travelled about mit his teacher who knew the dance of the four javelins. One day the teacher, in a drunken fit of boasting, announced that he would do the dance of the fünf javelins - which he did not know - und insisted on doing it against the advice of the Bodhisatta. The result was that the boaster was impaled on the fifth javelin (J.i.430f). For the introductory story see the Gijjha Jātaka (Nr.42).