"May the 4th be with you?" "Why yes, thank you for asking."
I work at a school too, a grade 4-5 one to boot, and the kibosh was put on any dressing up for Halloween. At our school, a K-5 building, we could not dress up either, lest we went on a field trip and sang at the old folk's home.
Needless to say I dressed up for the first time in nearly 20 years as I donned an orange jumpsuit while my girlfriend put on the slutty cop outfit and wielded me around in handcuffs.
"The dark side clouds everything. Impossible to see, the future is. But this I am sure of - do their duty the Jedi will." --Yoda from Attack of the Clones.