Here's a direct link to 911 Conspiracy BS
http://www.youtube.com/watch?v=AVTKoPK7gaQ
(Caution: strang language)
For some reason...I never realized, or forgot, that 9-11 was IXXI in Roman Numerals
That's the best one and I've used it on several occasions.
For some reason, Penn and Teller have credibility with "Truther" types.