In Randi's latest commentary at http://www.randi.org/jr/081205another.html#6, he quotes a section from the University of Virginia's physics department dealing with why Free Energy claims can't work, then later writes:
While petreous projectiles are definitely a thing worthy of avoidance, personally, I'd be more worried about that Pigeon Radiation the quote mentions earlier.Now that I know how to reach you, I’ll be sending all these people to you.
Just kidding! Hold those rocks!