How Do You Keep Twins a Secret?

How would you react if a family member or a friend didn't tell you they were having twins?

This couple kept the gender of their newborn babies a secret to everyone including themselves. The bigger secret (which they knew) that they kept from everyone including their own parents was that they were having twins. Here is a super awesome video of all the people finding out they had twins. These reactions are pretty awesome.  What would you do?