Lot of material to work with, but here are your choices:

1) McCain surrogate Phil Gramm stepping in and pronouncing America a "nation of whiners" suffering from a "mental recession." He's still got that '96 touch, doesn't he?

2) George W. Bush calling out to Italian PM Silvio Berlusconi in Spanish, "Amigo! Amigo!" Must be something in the G8 water.

3) Barack Obama exiting the stage at a NY fund raiser last night before belatedly remembering to implore the crowd of donors to give money to retire Hillary Clinton's debt. D'oh!

And, no, Jesse Jackson's flub is not on the list. I wanted it to be at least a little competitive.

UPDATE: Another late entry from George W. Bush:

The American leader, who has been condemned throughout his presidency for failing to tackle climate change, ended a private meeting with the words: "Goodbye from the world's biggest polluter."

He then punched the air while grinning widely, as the rest of those present including Gordon Brown and Nicolas Sarkozy looked on in shock.