Line Endings.
I had a lengthy article here -- browsers, typewriters, javascript blah blah blah, cultural tolerance to backward incompatability in Mac and Microsoft worlds, blah blah blah -- but really, the Hanselman pretty much beat me to it, and all I've got left is a cartoon.
((As a derivative of a GPL'd work ("Tabs."|"Spaces."|"Both."),) The above image is licensed to you under version 2 of the GNU General Public License.)
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