"Bubble" is just "babble"—plus u. Buy! Buy! Buy! Buy! High! High! High! High!

The farther we get from the last economic collapse, the closer we get to the next economic collapse. But which bubble is next to pop? Student loans? Desert real estate? Today, we turn our untrained eye to the backbone of the U.S. stock market.

There are murmurs of surprise that videogame retailer GameStop has made its way onto the S&P 500 index. More than a decade ago, it was bankrupt. Now it's eaten not just its competitors' lunch, but its entire competition, consuming Babbage's, Software Etc, NeoStar and Electronics Boutique. It's one of those great…