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Wash the object you’re using if you plan to eat the Jello. Let the Jello set in the refrigerator for 4 hours.
Keep everything sanitary by washing the object with soap and warm water. Then rinse it off thoroughly to remove any suds.  Placing office supplies like staplers into the Jello is a common workplace prank. For party desserts, try using plastic fish and blue Jello to look like a lake. Other toys and action figures also add a fun twist to this project. If an object is heavier, like a stapler, make sure it has a flat surface area so it sits on top of the Jello rather than poking through. Also if you’re going to eat the Jello, don’t use a small or sharp object that could injure someone. Be especially careful if you’re serving the Jello to children. Use large objects that they can’t swallow. Check any objects you use for small pieces that might break off. Remove these before encasing it in Jello. Once you’ve poured the second batch of Jello, place the bowl back into the refrigerator. Give the Jello another 4 hours to set completely.  Remember, the Jello has to be very firm for this trick. Don’t take it out early. Only cover the bowl with plastic wrap if there is uncovered food in your refrigerator that might transfer to the Jello.