Very likely not! But President Obama won't rule out sabotage as the cause of yesterday's stock market plunge. Please let it be bored Chinese high school hackers and not systemic instability produced by out-of-control computer trading! [The Hill, photo via]

As you are probably aware, the stock market today fell faster than a newborn foal on roller-skates, then rebounded like Shaq on stilts. No, that's not right. Can we think of a better metaphor for what happened today than "roller-coaster?"