Elizabeth Holmes, the founder of failed blood-testing startup Theranos, was a big hit this year for Halloween, to the extent it may have caused a shortage of black turtlenecks around Silicon Valley. One person to get in on the trend was famed journalist Katie Couric.

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Read more: Silicon Valley retailers are running out of black turtlenecks, and it could be because people are going as Elizabeth Holmes for Halloween


A venture capitalist with the firm First Round donned a cape and gold chain to be the email startup Superhuman.

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https://twitter.com/grlalx/status/1189944071344668673?ref_src=twsrc%5Etfw


The CEO of Cloudflare — a tech company with a recently successful IPO — trolled WeWork by dressing up as ousted CEO Adam Neumann. Matthew Prince donned Neumann's long hair and notable "Made by We" t-shirt.

Foto: WeWork cofounder Adam Neumann.sourceMichael Kovac/Getty Images for WeWork


WeWork's dramatic fall from grace inspired a multitude of costumes in time for Halloween. This alternate version of Neumann spoofed the WeWork's cofounder billion-dollar buyout from the company.

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Read more: Former WeWork CEO Adam Neumann inspired some of the best Halloween costumes this year


Working on Halloween can be a little more difficult, however, if you're honoring public transportation. A Twitter user dressed up as a MARTA bus, an ode to the transit system in Atlanta.

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https://twitter.com/morgan_jacobus/status/1189878772557910016?ref_src=twsrc%5Etfw


Arguably the most notable influencer of 2019, Caroline Calloway, was a popular pick for "Calloween." People donned flower crowns, shirts reading "scammer," and Yale plates to replicate the infamous influencer.

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Read more: People celebrated 'Calloween' by dressing up as controversial influencer Caroline Calloway, donning flower crowns and 'scammer' shirts


Halloween also brought out the largest (and cutest) pair of AirPods ever known. Canadian TV personality Jessi Cruickshank dressed up her young twins as a pair of AirPods (the first generation), and even earned a Twitter shoutout from Apple CEO Tim Cook.

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The 23andMe DNA testing kit was a source of inspiration from the queen of the DNA test herself, "Truth Hurts" singer Lizzo. The costume came with a sparkly swab, and opened up to reveal the DNA results: "100% that b----."

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http://instagr.am/p/B4T3c8ZhVQb


Washington, D.C.'s love-hate relationship with its city's electric scooters was on full display with this Twitter user's inventive costume of a Lime e-bike.

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https://twitter.com/emdubbbb/status/1190086234334355457?ref_src=twsrc%5Etfw


Internet trends also spawned some of the most popular Halloween costumes this year. It's likely you saw at least one or two VSCO girls out on the streets with their scrunchies, Birkenstock sandals, and Hydroflask water bottles.

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https://twitter.com/lexiihern/status/1189970993655074816?ref_src=twsrc%5Etfw


YouTube power couple Jake Paul and Tana Mongeau paid homage to another pair of famous YouTubers, Jeffree Star and Shane Dawson. "We dressed as the ppl that saved our careers," Mongeau wrote in a tweet.

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Read more: Tana Mongeau and Jake Paul dressed as Jeffree Star and Shane Dawson for Halloween because the YouTubers 'saved' their careers


Paul's older brother, Logan, recreated Johnny Lawrence's look in "The Karate Kid," complete with a black karate gi and headband.

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Meanwhile, YouTuber and former Vine star Liza Koshy posted her Halloween interpretation of Mahatma Gandhi. "Gandhi has done so much for the world..." Koshy wrote in the caption. "But what did we not see him do? This is life for him today."

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Read more: YouTuber Liza Koshy dressed up as Gandhi for Halloween and it's the best thing you'll see today


YouTuber Jaclyn Hill opted to go tongue-in-cheek this Halloween, dressing up as "cancel culture" following a disastrous launch of her own lipstick line earlier this year.

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https://twitter.com/allegedlyangelo/status/1188336007541866496?ref_src=twsrc%5Etfw

Read more: After her controversial lipstick launch, beauty guru Jaclyn Hill wore a 'canceled' Halloween costume at her annual party


This photo of Uber executives decked out in Halloween costumes was posted by New York Times' reporter Kate Conger. CFO Nelson Chai was dressed as a helium balloon, and sources told Conger that CEO Dara Khosrowshahi is dressed as a "bug basher."

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https://twitter.com/kateconger/status/1190341694794784768?ref_src=twsrc%5Etfw


Facebook CEO Mark Zuckerberg let his 3-year-old daughter, Max, pick out his family's costumes this Halloween. The result was a four-person garden: Zuckerberg was a drop of water, wife Priscilla Chan was a bumble bee, and their two daughters were dressed as the sun and a plant.

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Read more: Mark Zuckerberg dressed up as a drop of water for Halloween: 'That's what happens when your three year old picks the theme'