'Prom Night' dances to No. 1

• Story Highlights
• "Prom Night" earns $22.7 million as this weekend's No. 1 movie
  
• Brittany Snow plays a teen terrorized by a psycho killer on prom night
  
• "21" falls to third place after two weekends as No. 1
  
• "Smart People" opens at No. 7 with $4.2 million
  
• Next Article in Entertainment »