I think a witches hat or robe might not go amiss. It would be more identifiable than just the school kit. I love it when people go in theme to movies. Have fun :)
Yes I have:
http://216.77.188.54/coDataImages/p/Groups/60/60641/folders/32250/989523FatManAtComputer.jpg
Edit - Melia, as much faith as I have in total strangers I've got to admit the odd one out is bound to be a disappointment. ;)
A lot of Brits give a thumbs down when an American answers the question so why not. It swings in roundabouts. It's not great, but you expect it on the web.