Suck out the insides of an egg with a syringe(you have one right?), let it sit on the radiator for a day or so, fill a choccie egg without insides with it and leave egg on table.
If someone eats it, expecting a hollow egg sort of chocolatey treat, they get a mouth/handfull of rotting egg and you can smuggly wlak over to them and say; "That's teach you to take stuff that isn't yours. Now you owe me a new science experiment."
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