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How to sneak fiddling toys into school
Squash the slime or blue tack flat like a pancake and stick it in or under your desk.
No one looks or feels under or in desks, so your slime/blue tack is safe while you are in class. Quickly duck under your table and you teacher won't notice when you do it.
Do not do this too often: it is sometimes considered unhygienic, and people don't really want to sit near your slime. There is probably chewing gum under your desk too, and that makes the desks dirty.