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Dude! You gave away the answer.
But yeah, that's how you do it. Provide a demonstration of water draining in both directions along with a poster board explaining the Coriolis effect and why it is a massive force that is too weak on such a small scale (without the math, presumably).
Go way out on a limb and find an online pen pal to a web cam demonstration of the same mixed results from the southern hemisphere.
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