Gender reveal ideas?

Noona • 🇱🇧💍👶🏻👶🏻🇬🇧

My husband and I will be finding out in the room as they are not allowed to write it down for us to have a proper gender reveal but we want to do some kind of video to share with our friends and family either the same day or the day after we find out. What are some quick and easy gender reveal ideas (preferably not messy) that we can do? We want the turn around to be quick as everyone is counting down the days til the 14th and our families will likely get pissy with us if we didn't tell them right away lol