Someone who makes a seemingly innocent remark but still offends somebody.

Originated in "Calvin & Hobbes 14-02-1986" and is a widespread humorous response to a comment on slashdot.org
Comment: If the Windows emulator for Linux is Wine, I guess the Mac emulator for Linux would be Mace?

Response: It's a "compatibility layer", you insensitive clod!
by Verlorenes Metallgeld July 17, 2008
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