Things to do to lockers of people you do not like?

This girl at my school went slightly to far and since ive been down lately it was the worst possable time for her to pick haha. it doesnt matter what she did i would just like to know some creative ideas that i could involve her locker, since we do not have locks on our lockers at my school i could easily open her locker and put something in it. she is a vegetarian so she likes animals. but she also gets scared very easily so i was thinking of putting a couple of mice in her locker on the top shelf and hoping they would jump out but i don’t think that alone would be satisfactory. i also thought of freezing a can of whip cream then taking it to school and opening it then dumping it in her locker… but that wouldn’t really do it for me either. does anyone have any suggestions? and for now lets say her name is vicky.