Twin Shocks
This is actually pretty funny. First, the pregnancy is causing mom to throw up – as pregnancies tend to do. Then, the discovery that they’re having twins is causing dad to throw up. I’m sure that finding out you’re having twins is a bit of a shock for any expectant couple.
But don’t worry, the shock will at some point be replaced by elation and excitement, and just like mom will stop throwing up (hopefully after the first trimester), dad will too: he’ll get used to idea and fall in love with it. In the meantime, laughing about it seems like a healthy, normal and effective coping mechanism.