Randomness in a list box

just finnished the tutorial on listboxes which was realy clear and consise
My question is
is it possible to produce a list of something e.g 1,2,3,4,5,6,7,8,9
but when the list box is displaye it throws in a symbol in a random position
e.g 1,2,3,,5,6,7,8,9 and then viewing it a second time it may be
Hope someone can help