When a billion people are watching, the Oscar stage is a tempting place to broadcast your political views, as more than one star or filmmaker has chosen to do. It's not always a popular choice, as Vanessa Redgrave or Michael Moore can tell you.

Controversial Oscar moments aren't always about politics: Among the other scandals are a shockingly naked stranger, a barely-dressed starlet, and a persistent rumor about one surprising win.

Most Controversial Oscar Moments