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Wear a hat that says "School sucks", and when the photographer asks you to take it off, reveal a bald cap with 3 thick black hairs sticking out of it, snd "school really sucks now" tattooed on it
"Squibs are also used in many movies along with blank firing guns. A condom is filled with fake blood and other chunks of sponge are used to thicken it up. The blood pack is placed on a squib and when it is remotely triggered the blood pack explodes, giving off a realistic looking gun shot with blood flying out of the wound."
I saw a thing about squibs on MythBusters, but I thought they were saying "squid." I'm glad you posted this, joelf, before I attempted to say it out loud.