Baby Cakes

Lizzie Skurnick explores a bizarre trend, the Cake Gender Reveal, wherein a couple learns the sex of its baby by the color of the inside of the cake:

Why cake? I know I just asked that, but now I mean it because I think this is happening because CAKE IS WHAT WE USE ON A BIRTHDAY. This is lame! Why not an envelope that releases a stream of urine into the air if it's a boy; a devastatingly cruel giggle if it's a girl? Why not have the audience place bets, so that one partner can forever feel betrayed by the heretofore unacknowledged but distinct preference for what cannot be?