And the contestants were...
Little Red Riding Hood and the Big Bad Wolf
Old-ish lady going on a brisk morning walk
A guy with one exotic pet and one normal pet
George Michael in "Wake Me Up Before You Go-Go"
Tina Belcher from Bob's Burgers
Crew Members of Starship Enterprise Collecting Data From Disney World
The only person who doesn't have Ebola in the LA office and Dallas Ebola Club
Amy Poehler's Kaitlin from Saturday Night Live
High School Art Teacher Dressing Up for Halloween
Anaconda Moonrise Kingdom
Rosie the Riveter and Beaker
The Ladies of Saved by the Bell
The BuzzFeed Ping-Pong Team
The Log Lady from Twin Peaks
Lumpy Space Princess from Adventure Time
Steve Kandell, BuzzFeed's Features Director
Agatha from Grand Budapest Hotel
A Banan-ibal (Banana Cannibal)
Bob Ross from The Joy of Painting
Dorothy from The Wizard of Oz
Some people didn't partake in the contest, but came to work in awesome costumes anyway!