It's not really that weird, if you clip it in the case any static will flow pretty much band->
case&PSU->earth wire of you comp's power cable->socket(in the wall)->wherever
When plugged directly in the wall, the parts I highlighted blue will just be skipped, but in practice it still does the exact same thing. Just make sure you don't clip it in the live wire
(I did get your question right, didn't I???)
EDIT: Also, in the future you may want to just create a new thread, no need to dig up old threads only because they're somewhat relevant to your question.
Cheers