President George H.W. Bush once vomited on the lap of the Japanese prime minister.
In January of 1992, President Bush was in Japan at a state dinner held at the home of Kiichi Miyazawa. Bush had not been feeling well prior to the event, and reportedly had been told by his doctors not to attend. Never one to refuse hospitality, Bush decided to soldier on through his flu, and expressed his gratitude to the prime minister from the bottom of his...stomach.
The illness caused quite a scene - it's not too often that you see a president go completely pale and topple over onto a foreign diplomat:
(source)
