From today's NYTimes:

Between platters of lamb and rice, Mr. Biden and two other American senators questioned Mr. Karzai about corruption in his government, which, by many estimates, is among the worst in the world. Mr. Karzai assured Mr. Biden and the other senators that there was no corruption at all and that, in any case, it was not his fault.

The senators gaped in astonishment. After 45 minutes, Mr. Biden threw down his napkin and stood up.

"This dinner is over," Mr. Biden announced, according to one of the people in the room at the time. And the three senators walked out, long before the appointed time.

There once was a leader named Karzai
Whom diplomats caught in a fat lie
This ended the feast
All aid quickly ceased
Which led to that poor Afghan's banzai.