The song remains one of Keri Hilson's most significant commercial achievements:

Directed by , the music video premiered on March 12, 2009.

: It depicts a love triangle where Hilson is caught between her former partner (played by West) and her new love interest (played by Ne-Yo).

: It is set in the key of G minor with a moderate R&B groove and features electronic tones, "stabbing" synths, and a thumping bass-beat. Chart Performance and Accolades

The lyrics explore how a powerful love can unexpectedly "knock you down," often depicted as a metaphor for falling so hard for someone that it disrupts your usual composure.

: The video includes scenes of Kanye West painting a portrait of Hilson and a physical confrontation between West and Ne-Yo that visually represents the song's title.