If Tacos Make People Smart, Why Are so Many Taco Fans Dumb?

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Tacos make you smart.

Specifically, rats given cumin-spiked water learned things more quickly, and were more resistant to a drug that mimics the effects of Alzheimer's. Earlier this year, rats whose diets were 5 to 15 percent cilantro also showed signs of having stronger brains.

We know some pretty bright taco-eaters who lend credibility to these studies. So why is it that so many taco-lovers are portrayed as being complete dumbasses?

Gir from Invader Zim had a serious love for tacos.

Conan O'Brien has a dancing taco.

Beavis and Butt-head in Spanish class.

Blowing up a taco, Beavis style.

Try getting the anime taco song out of your head before it destroys half your brain cells.