The real Princess Unicorn backstory:

Princess Unicorn is from a distant land on a distant planet far away in the future. She came from her father, king of the unicorns, and her mother, queen of the princesses. Sorcerissa, the evil witch, cast a spell on Princess Unicorn’s parents, forcing them into another dimension, and doused Princess Unicorn in radiation. The radiation did not hurt Princess Unicorn, but gave her magical powers. She can summon her magic by holding her wand and calling out, ‘My horn can pierce the sky!’; Now she uses her magic and beauty to write for her school paper, defend her kingdom, and battle Sorcerissa so she can be reunited with her mother and father some day.

Princess Unicorn

This conviction, that technological innovation will obviate the need to make any actual changes in the domestic economy and human geography, paralyzes intellects across the whole of American politics and culture. They imagine the future as a sort of Jetsons pastiche, where everything is the same, except that it flies.

http://whoisioz.blogspot.com/2008/11/same-but-its-different.html

Where have I heard this before? Oh yeah… Absolutely everything was the same, except I could fly:

We Just Can’t Know

Of course, we do not know what would have happened had fiscal and monetary policy been to provide a weaker stimulus, or none at all. http://econlog.econlib.org/archives/2008/11/lectures_on_mac_3.html

As my friend Mike pointed out recently, I love arguments of this form.

Also, my favorite ever claim that there “would be no way of knowing”: