Alphabet song: "X" is for "Box"?

So I'm a little confusing as I'm listening to an alphabet song YouTube when it gets to X, it says that X is for Box??? I'm 15 and I don't see how that is possible! Here's the link if you want to see for yourself, it has 470 MILLION views and not one parent has brought this up, am I just retarded? https://youtu.be/BELlZKpi1Zs

Windowphobe2017-08-09T23:25:49Z

Not "just," no.