3rd Culture kids

How do you know if your kids are "third culture kids"?  This is how.  We're studying for math one afternoon, and I'm helping Duncan and Ella Jade brainstorm things that are the shape of a cylinder. Since a Pringles' can is all they can think of, I ask, "How is water brought to the house?"  I'm expecting the response, "pipe".  Duncan says, "Gerry-Can!"  Now, for those of you who don't live in Africa, a gerry can is how most people collect and carry water.  However, we have never used a gerry can, nor is it cylindrical.  Therefore, my kids are officially "third-culture" kids!