Not sure if this was shown on here or not, but came across this......
August 12, 1999
The Daily Show with John Stewart
Comedy Central Channel, USA link
I've seen it before...but thanks for posting it. I don't know about the US version of the Daily Show, but for those of us who live in India, we get a weekly feed of the Daily Show called the "Daily Show World Edition" on CNN and a few years back Jon Stewart made a reference to that episode when he was talking about the early days of the Daily Show and he showed 2-3 min clip from that episode(the Mercury Rising one).