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JPMorgan chief Jamie Dimon and Citigroup CEO Vikram Pandit don't like each other much: In one widely-reported encounter between the two men earlier this year, Dimon told Pandit to "stop being such a jerk" on a conference call of Wall Street CEOs. It looks like Dimon is getting the last laugh. Not only did Citi announce another huge loss today, and embarrass itself last week with its failed bid to acquire Wachovia, now Dimon's JP Morgan has officially surpassed Citi as the largest bank in the US. If it's any consolation, Vikram, you do live in a nicer apartment building.