Panic Button

I have definitely sent an email or two that should NOT have gone out. Or hit Reply All to a mass email when only meaning to talk to one specific person. PANIC!!

Well thank goodness for GMail's latest feature: The Undo Sent Button!
It supposedly allows you to "unsend" an email within a 5 second window of hitting Send.

Read more here: http://www.tgdaily.com/html_tmp/content-view-41801-140.html

But like the author of the above article, I'm curious if this is like the "Google Paper" prank from April Fool's past where they offered to send you copies of every email in hardcopy format. Perhaps this is too good to be true... We shall see!