Spotlight on Jamie Dimon, Chief executive, JPMorgan Chase

A harsh spotlight on Mr Dimon, in fact

The self-styled smartest guy on Wall Street has been called to Capitol Hill to explain how JPMorgan, styled by Mr Dimon as the safest bank on Wall Street, managed to lose $2bn-plus and counting on credit derivatives. The showdown is tomorrow.

And we're expecting a circus?

The biggest since hearings into the Wall Street crash during the Depression, when things got so bizarre a circus promoter plopped a performing dwarf on the lap of the great John Pierpont Morgan.

You're exaggerating?

Perhaps, but supporters of Wall Street reform are thrilled at the chance to humble Mr Dimon, who has pushed back against "stupid" regulation at every turn these past years. They say the JPMorgan debacle proves banks are simply hiding risky trading in quiet corners.

Humble's a word not normally associated with him

The wunderkind scion of a family of Greek-American stockbrokers, he rose at the side of Sandy Weill, who built Citigroup, until the pair had an inevitably vicious falling-out. Mr Dimon navigated the credit crisis so successfully he appeared untouchable. Until now.

Dimonfreude. There's another word

Coined in the wake of the trading losses, it means taking great satisfaction in the misfortunes of the JPMorgan boss.

And on the substance?

The Senate banking committee will want to know what its witness knew about those trades, by the London Whale, Bruno Iksil, and why Mr Dimon originally chose to wave away concern as "a tempest in a teapot". And there's the little matter of the Federal Reserve.

The Fed?

Mr Dimon is on the board of the New York Federal Reserve. Politicians say that's a conflict of interest. Ben Bernanke, Fed chairman, points out that Congress mandates banker participation, but he would have no problem changing that. We await Mr Dimon's view.