When 4.0 came out, Blizzard quickly implemented a quick hotfix that increased the effect of resilience by 50%. This change was not reflected in the tooltip.
This is an example of how fucking awesome this change is. 4.0 4evaaaa
EDITOR'S NOTE - I'm aware that I released this on youtube a month and a half ago. I was going to put it on WCM too, but when the uploader malfunctioned, I just kind of let it sit and didn't think about it again. When I took a glance at my youtube channel and saw the views had spiked up, I saw that it was embedded on WCM. Apparently, they found a download link and took it into their own hands!
Please take this video for what it is, an archive of how funny resilience was last patch, with some chill music. Thanks!