I'm trying to come up with a creative game to reveal the gender of our baby. like a puzzle or game people would have to…

I'm trying to come up with a creative game to reveal the gender of our baby. like a puzzle or game people would have to do to figure it out. either sent through text, email, and Facebook. please help me. I don't want it to be something they can just skip to the last word and it'll say boy or girl.