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Have bowls of balloons. People pick the balloon that matches their guess for the gender. Poke holes in the balloon matching the color that is not the gender, and have everyone try to blow up the balloons at once. Only the correct balloons will blow up.
Measure belly at the baby shower! Except without the bowl and tape... Just walk around with the thing of ribbon and have people measure then and hold onto it for a few minutes, then the mom goes around and everyone measures the mom to be