Earlier this month, Barack Obama was meeting with House Speaker Nancy Pelosi and other lawmakers when Rahm Emanuel, his chief of staff, began nervously cracking a knuckle.
Mr. Obama then turned to complain to Mr. Emanuel about his noisy habit.
At which point, Mr. Emanuel held the offending knuckle up to Mr. Obama's left ear and -- like an annoying little brother -- snapped off a few special cracks.
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