Britney Spears - Break The Ice

Fan video style: Life imitates art - Children's pastime set to Britney's comeback track.
Official video style: Art imitates life - When Britney is institutionally admitted, cartoon Britney fills in for her.
Helpful reminder: The fan vid came first.
Other notable mention: Second-best song from album (The best song from Britney's Blackout record -- "Radar" -- would've been released as a single had "Womanizer" not been rushed to the market to sully the Britney comeback with a cash grabbing crap follow up.)