Tech or Treat! 40 geeky Halloween costumes

Geeks know how to party and Halloween is no exception. Forget witches and goblins - Here are some scary and clever costumes from the tech world!

Halloween brings out the geeks. It's the one day of the year for which it's okay to pour 10 hours or more into making a perfect life-size replica of your favorite social network.

I can has Halloween party? Two attendees at a New York costume ball hosted by hipster hub Flavorpill dressed up as incarnations of lolcats, those cute kitty photos with silly misspelled captions. On the left, one lolcat says "I R SKAREE" and the lolcat on the right has opted for the more classic tagline of "I CAN HAS CHEEZBURGER?"

Take us to your leader! Check out Reddit co-founder Alexis Ohanian dressed as his company's mascot and logo, the Reddit alien.

Okay, it's not a costume so much as it is a cheap helmet made from a cardboard box. But it's nerdy, and it's something CNET's Will Greenwald is strangely proud of.

Oh my god, it's a double rainbow! All the way!

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

These days, now that vintage Nintendo is retro-cool for good, it's almost impossible to go to a Halloween party and not run into someone in a cartoonish plumber outfit. Here, a guy dressed up as Super Mario breaks it down on the dance floor.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.

Halloween is the one day of the year when it's okay to go all-out on a geeky costume.