What you'll need:
Black suit
White collared shirt
Black tie
This mask
Laptop (optional)
Are you into social anarchy? What about the internal online destruction of capitalist companies and media conglomerates? Even if you have the computer skills of a 6-year-old, you can easily dress like a dapper hacker this Halloween. A simple suit plus the legendary Guy Fawkes mask from Alan Moore's graphic novel V for Vendetta will be useful in concealing your identity and causing partygoers to hide their mobile phones, just in case you're part of the real-deal hacking collective. After all, no one wants their Twitter feed compromised with pictures of their party-time indiscretions.