The William J. Clinton Foundation's Decade of Difference Concert included many memorable moments.

Kenny Chesney (and Grace Potter) joined a performance roster that included surprise guest Stevie Wonder, U2's Bono, and pop stars Usher and Lady Gaga.

When the former president took the stage,he thanked Chesney "for coming so I wouldn't be the only person up here with an accent."

The folks at Funny or Die produced an original video celebrating the William J. Clinton Foundation's 10th anniversary. Ben Stiller, Matt Damon, Kristen Wiig, Sean Penn and a few surprise guests act out an unlikely scenario as members of the Foundation's important Celebrity Division.