Argon walks into a bar...

Nobody notices because argon is a tasteless, colorless, odorless, and nontoxic gas.

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A chemist and his friend walk into a bar.

The chemist says "I'd like a glass of H2O." So the bartender gave him water.

His friend said "I'd like a glass of H2O, too."

So the bartender also gave him water, because he knew what he meant and had no conceivable reason to be carrying hydrogen peroxide, much less to be giving it as a drink.

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