I posted about this a few weeks ago, and now Twitter has supplied another example:
This trader would still be in a not bad position but, once his stop was triggered, he got hosed for a $2.41 loss. Nothing is more frustrating. If you can’t be at your screen, then you may have to use a hard stop. Otherwise, keep it close to your vest.
Here is Hunsader’s wonderful close up of gold futures plunging $30 (instantly) on heavy volume, and triggering a ten second halt.