Hosts Nick Tommarello and Mike Norman survey the crowd at Vampire Hackathon 2012
Anna Callahan came dressed as an elegant vampire. See the full photo set - she draws blood (well, almost.)
Coding devil Sherry Zhao sneaks up on an unsuspecting hacker.
Julia Winn poses for a classic Halloween/British Phone Booth combination.
Angel investor and Wefunder backer James Alvarez enjoyed the action. Word on the street is that he did not do any coding.
Wefunder co-founder Mike Norman wields his video camera looking for postable moments.
And finally, this. Can you figure out what's going here? Thanks to some willing models - Fredrik Kaupang and Elise Moussa.
Here is the full set of photos: (online and downloadable here