Making a Kiddush Hashem

Yisrael must be learning about making a Kiddush Hashem in cheder...but seems that he got a little confused (maybe because of the the Ivrit?)- today he was playing with legos, and he came up to me holding a big tower, and said, "Look Mommy- I made a really big Kiddush Hashem!" I guess I'll have to sit down with him and explain what a Kiddush Hashem really is...although its not such an easy concept to explain to a three-year-old, even in their mother tongue!