In 2004, after losing the Best New Artist Grammy to Arkansas mall goths Evanescence, rapper 50 Cent showed his displeasure by walking onto the stage with the band, nudging the band members aside as he walked past the microphone, down the entire length of the stage, and back to his seat. He later apologized and publicly berated Kanye West for his infamous interruption of Taylor Swift's 2009 VMA speech.
[50 Cent, Evanescence via]