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They say mistakes make us human. No mortal being is perfect, after all, and even the most skilled individuals will commit errors.

But there is a difference between an honest mistake and a blunder on a lone, straightforward task. And somehow, some people still commit the latter, which makes the situation hard to believe.

Here are some of the best examples we collected from the One Job subreddit, which, by the name itself, should already give you a clue about what to expect.

#1 This Anime Girl Mousepad Was Printed Upside Down

#2 Putting The Covers Back In The Right Order

#3 Ambiguous Word Placement In Inspirational Sign

Many mistakes in these posts likely result from oversight, which happens to all of us. What makes them even more magnified, however, is that such lapses are not expected of people with one job to do.

That’s because as marvelous and intricate as the human mind is, it can still commit mistakes, even when you try to avoid them. As the late American psychologist and Nobel Laureate Dr. Daniel Kahneman explained, it’s usually due to an override between our brain’s two systems.

#4 At The Hospital

#5 For Who Is This Sign?

#6 Please Write Happy Birthday Instead Of I Love You

In a 2012 interview with the American Psychological Association (APA), Dr. Kahneman called the automatic, intuitive mind “System 1” and the controlled, analytical mind “System 2.”

He says System 1 often leads us to predictable errors, especially when System 2 doesn’t check it.

#7 Properly Placing A Mirror At A Sephora

#8 We All Scream

#9 When The Bank Machine Can’t Math

“System 1 is very efficient and highly skilled, and in general it’s monitored by System 2,” Dr. Kahneman explained. “But in general, we’re experts at what we’re doing; we do most of what we do well, so System 2 mostly endorses and generates actions from System 1.”

#10 Some Kids Drew An Anti-Racism Poster And Used “White Heart” As A Synonym For Better Heart

#11 Well Done, Sir!

#12 Write No Smoking In Arabic

Another possible reason people make mistakes they shouldn’t is that they fail to learn from previous ones. But according to a 2024 study by the American Psychological Association, a past failure doesn’t necessarily mean success, as many people believe.

As lead researcher Lauren Eskreis-Winkler points out, people who don’t learn from their failures find them demotivating and ego-threatening.

#13 No Smoking… Almost

#14 Looks Like They Nailed The Levels!

#15 Printed The Custom Sticker, Only Without The Customized Part

The reaction to someone committing an error they expectedly shouldn’t is often ridicule and shaming. However, experts say the focus should be on error-management training.

A previous APA study also suggests that effective training should include allowing people to make mistakes.

#16 Hmmmmm, This Is Easy Right?

#17 Let’s Help Global Warming, Sure

#18 At My Walmart Today

According to one of the study’s authors, Prof. Dr. Nina Keith, people who are allowed to manage their mistakes deal with frustration more effectively and become better at problem-solving.

“Trainers should consider refraining from the well-meaning tendency to provide help when participants are stuck on a task,” she said. “(Doing so) gives more responsibility to the learners, who become active learners rather than mere recipients of instruction.”