LOS ANGELES — Sandra Bullock's latest movie has taken the industry by surprise.

She stars in the football drama "The Blind Side" that has become the underdog hit of the season with a $20.4 million weekend and a box-office victory over "The Twilight Saga: New Moon." The Warner Bros. sports tale had been runner-up for the previous two weekends to "New Moon."

Estimated ticket sales for Friday through Sunday at U.S. and Canadian theaters, were:

1. "The Blind Side," $20.4 million.

2. "The Twilight Saga: New Moon," $15.7 million.

3. "Brothers," $9.7 million.

4. "Disney's a Christmas Carol," $7.5 million.

5. "Old Dogs," $6.9 million.

6. "Armored" (tie), $6.6 million.

6. "2012" (tie), $6.6 million.

8. "Ninja Assassin," $5 million.

9. "Planet 51," $4.3 million.

10. "Everybody's Fine," $4 million.