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em dashes are usually used to denote an interruption or sudden change — whether in dialogue, thought or narrative — ellipses are for pauses, again in all respects. 'I just don't see why— 'I d...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/14523 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
em dashes are usually used to denote an interruption or sudden change — whether in dialogue, thought or narrative — ellipses are for pauses, again in all respects. > 'I just don't see why— > 'I don't care what you think,' Johan barked, turning from me before I could protest. * * * > 'She was just...' His face turned pale as his memory returned to that night. > 'Just _what_?' I asked, eager for more. here are some resources: [Jodie Renner Editing](http://jodierennerediting.blogspot.co.uk/2013/09/how-and-when-to-use-hyphens-dashes.html) [Novel Publicity](http://www.novelpublicity.com/2012/03/ask-the-editor-when-do-you-use-an-em-dash-when-do-you-use-an-ellipsis/) [Writer's Relief](http://writersrelief.com/blog/2008/03/serial-commas-ellipses-and-em-dashes/)