Zombie apocalypse, meet tech: HootSuite, Zendesk, Pinterest, and more get freaky for Halloween

It’s Halloween tonight, and tech is celebrating with treats, freaks, and more than a little dressing up. Well, at least those tech companies that like to have fun.

This week, HootSuite and Zendesk engaged in a little zombie apocalypse competition for which I acted as a judge (no brains were eaten, at least not by me), and the results are hilarious.

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“Things can get a little crazy during a zombie apocalyse,” HootSuite’s video helpfully reminds. “Fortunately, HootSuite has lots of features to help you get through it.”

Here’s HootSuite’s video — and don’t miss the surprise ending:

And Zendesk’s, which also has a great twist at the end. Hint: Remember to stock lots ice cream.

Pinterest did something a little different.

Instead of making a video, Pinterest simply made eminently pinnable images by inviting staffers to dress up. Here’s some of the best efforts, sent in by Pinterest:

I asked for your pix and videos on Twitter this morning, and here’s a few more submissions from startups and tech companies.

These are from Cooliris, where Mehereen Agha says the company is all about photos, and “I am sharing some candid photos taken while our zombies, Barneys, pharoahs and Flintstones were hard at work.”

And these are from BetterCloud, where there are some human hashtags, +1s, some crossdressers, and some I’m not quite sure whats:

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PasswordBox has created an official Zombie Contingency Plan, in which, if you become a zombie, your passwords will be delivered to your not-yet-undead next of kin (who are supposed to keep one of your hands so as to be able to unlock your iPhone 5S).

Here’s a pic from PasswordBox, as well as a few from Clearleap, an Atlanta-based startup in the multiscreen video space, and NerdWallet, a personal finance site. Nerdwallet doesn’t just manage money — the company gives it out, supplying the most-creatively costumed employee with a $250 Amazon gift card:

What did your company do? Let me know, and I’ll add it here.