"A �", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License
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If you want in on the fun, map a key on your keyboard to the sequence U+0041 U+0020 U+FFFD (or U+0021 U+0020 U+FFFD for the exclamation point version), and then no update can never take this away from you.