From the Manual of Appropriate Workplace Humor:

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When you decide to kid the boss, be careful about the timing.

What's Your Problem?

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"It's genetic, man! I was born this way and I'll never change!"

"Whoa. Way too deep."

Just Wait a Couple Months

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But! There is a Mac version of Civilization V. For that, all is forgiven. Also, Portal 2 was released simultaneously for Mac and Windows, so no worries there either.

~OLJ