Never mind how basic their initial words may be, getting to hear your tot's first is pretty momentous for any parent.。

For Michael McAvoy, the first word from his daughter sent him "over-the-moon," according to his tweet on Wednesday.。

And for the self-confessed geek, there's nothing more heartwarming than having your kids take after your passion.。

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What was the word?

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That's right -- "Batman."。

We bet McAvoy put a bit of work into getting his daughter to say "Batman" in time to the show's iconic theme tune.。

And the payoff was totally worth it.。

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