The Shoe Incident Most Embarassing?

USN&WR thinks not-

1. George H.W. Bush Vomits On the Japanese Prime Minister (1992)
2. George W. Bush Crashes Into a Police Officer in Scotland, Sending the Officer to the Hospital (2005)
3. Gerald Ford Falls Down the Steps of Air Force One in Austria (1975)
4. Ronald Reagan Falls Asleep While Meeting with the Pope (1982)
5. Bill Clinton Caught Celebrating a Favorable Ruling in a Sexual Case Through His Hotel Window in Senegal (1998)