Besides, mentioning Alan Greenspan gives me a reason to remind you all of the "Irrational Exuberance" Flash animation to the tune of Yatta!. It's months old, maybe years, but it's still wonderful and bizarre. This latter needs sound and Flash; neither is particularly suitable for consumption at work. Alternatively, tranquillo posted a fab calculus funny (the one at the end).
Many happy returns of the day to truecatachresis and to 2ndavemusic. This latter one is two days belated, so I blush with embarrassment.