From left, graduate students Sonika Johri, Dena Feldman, Meghan Krupka, and Serguei Bagrianski dressed up for the Oct. 22 Halloween Ball at Procter Hall in the Graduate College. (Photos by John O'Neill '13)

From left, graduate students Sonika Johri, Dena Feldman, Meghan Krupka, and Serguei Bagrianski dressed up for the Oct. 22 Halloween Ball at Procter Hall in the Graduate College. (Photos by John O'Neill '13)
From left, graduate students Sonika Johri, Dena Feldman, Meghan Krupka, and Serguei Bagrianski dressed up for the Oct. 22 Halloween Ball at Procter Hall in the Graduate College. (Photos by John O'Neill '13)
"Occupy Sesame Street" won the night's costume contest. The protest participants were, from left, Chad Maisel, Stephanie Durden, Camilo Forero, Laura Tatum, and Sebastian Chaskel. (Photos by John O'Neill '13)
"Occupy Sesame Street" won the night's costume contest. The protest participants were, from left, Chad Maisel, Stephanie Durden, Camilo Forero, Laura Tatum, and Sebastian Chaskel. (Photos by John O'Neill '13)
From left, C.J. Bell, Jebro Lit, Ana Bell, Mariana Socal, and June Yeung. (Photos by John O'Neill '13)
More creative costumes from Procter Hall-oween. (Photos by John O'Neill '13)
Cara Carraher, left, and Sohanna Akan. (Photos by John O'Neill '13)
Cara Carraher, left, and Sohanna Akan. (Photos by John O'Neill '13)
Where's Waldo? The striped character blended in with the colorful party-goers. (Photos by John O'Neill '13)
Where's Waldo? The striped character blended in with the colorful party-goers. (Photos by John O'Neill '13)
Procter Hall's Hogwarts-esque atmosphere took on a neon glow during the dance party. (Photos by John O'Neill '13)
Procter Hall's Hogwarts-esque atmosphere took on a neon glow during the dance party. (Photos by John O'Neill '13)
Contestants strutted on stage for the costume judges. (Photos by John O'Neill '13)
Contestants strutted on stage for the costume judges. (Photos by John O'Neill '13)
No Princeton party would be complete without a healthy dose of orange. (Photos by John O'Neill '13)
No Princeton party would be complete without a healthy dose of orange. (Photos by John O'Neill '13)
Costumes ranged from rock 'n' roll to Robin Hood. (Photos by John O'Neill '13)
Costumes ranged from rock 'n' roll to Robin Hood. (Photos by John O'Neill '13)
Big Bird and friends reveled in their first-place finish. (Photos by John O'Neill '13)
Big Bird and friends reveled in their first-place finish. (Photos by John O'Neill '13)
Even heroes and villains get along on Halloween. (Photos by John O'Neill '13)
Even heroes and villains get along on Halloween. (Photos by John O'Neill '13)