HaShem is looking for someone to become his Chosen People. So he sets about finding a Nation that will accept his Commandments.
He first goes to the Babylonians, and says, "I am HaShem, King of the Universe. Would you like a Commandment?" And the Babylonians reply, "What's a Commandment? Give us an example." So HaShem says, "Thou shalt not steal." And the Babylonians say, "Do you have any idea what that would do to our economy?! We'll pass."
So HaShem goes to the Egyptians next, and says, "I am HaShem, King of the Universe. Would you like a Commandment?" And the Egyptians say, "A Commandment? Like what?" And HaShem says, "Thou shalt not commit adultery." And the Egyptians reply, "That would completely ruin our weekend plans. Thanks, but we're good."
So HaShem goes to the Assyrians, and says, "I am HaShem, King of the Universe. Would you like a Commandment?" And the Assyrians say, "I mean, maybe. What sort of Commandments are we talking?" And HaShem says, "Thou shalt not commit murder." And the Assyrians say, "Whoa, hold on now. We love murder. If that's the Commandment, then no, thanks."
So finally, HaShem goes to the Jews, and says, "I am HaShem, King of the Universe. Would you like a Commandment?" And the Jews say, "How much do they cost?" A bit surprised by this answer, HaShem says, "They're free." And the Jews say, "We'll take ten!"
