The Unexpected Use Case Post: When Your Product Surprises You
You build a product for one audience. Someone else uses it for something completely different — and often more interesting. When this happens, the story writes itself. Unexpected use case posts are some of the highest-upvoted content in r/SideProject because they combine product revelation with genuine human surprise. The best versions of this format aren't just 'look at this weird use case' — they're reflections on what your product actually is, told through the lens of how real users interact with it in ways you never anticipated.
Pattern Overview: Unexpected Use Case
Average score
When to use
When you discover that a meaningful number of users (or even just one remarkable user) is using your product in a fundamentally different way than you designed it for. Works best when the unexpected use reveals something genuinely interesting about human behavior or market gaps.
When to avoid
Do not manufacture an 'unexpected use case' for engagement. The community can smell fabricated stories. Also avoid if the unexpected use is illegal or harmful — you'll need to navigate that carefully or not post at all.
Post structure
Title: State what your product was supposed to do and the surprising thing it was used for
Brief product intro: What you built, who it was for, when you launched
The discovery: How you found out about the unexpected use (support ticket, analytics anomaly, direct message)
The use case in detail: Explain the unexpected use thoroughly — this is the most interesting part
Your reaction: Honest, unfiltered — surprise, confusion, amusement, or even discomfort if applicable
The reflection: What this tells you about your product's actual value vs. your intended value
What you did next: Did you build for this use case? Did you ignore it? Did it change your roadmap?
Real viral examples
The deliberate vagueness ('a way I never imagined') is brilliant — it forces a click to find out. The word 'silly' disarms any pretension and makes the eventual discovery feel more surprising.
This is a masterclass in the unexpected use case format — the use case is genuinely unexpected, the founder's ambivalence about it is honest, and the $3k/month detail makes it a real business consideration, not just an anecdote.
This is perhaps the most geographically improbable use case imaginable — and that's exactly why it works. The combination of the extreme unexpectedness and the human interest angle (two real people in the world's most isolated country) is irresistible.
The absurdity of the product description creates immediate curiosity. $5K in 3 days for what sounds like a joke product makes this both funny and genuinely informative about the market for novelty apps.
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How to write this type of post
Start with a brief description of what your product was supposed to do — this is the baseline that makes the unexpected use case surprising by contrast.
Describe how you discovered the unexpected use case with specificity. 'I noticed in my analytics that 23% of users were doing X' is more compelling than 'someone told me.'
Don't moralize about the unexpected use unless absolutely necessary. If the use case is surprising but not harmful, your job is to describe and reflect, not judge.
Include your emotional reaction honestly — surprise, confusion, mild discomfort, amusement. The reader wants to experience the discovery alongside you.
Explain the implications for your product or business. Did this change how you think about your market? Did you build features for this use case? The 'so what' matters.
If the unexpected use case is recurring (many users doing it, not just one), share that data. 'I found one person using it this way' is a story. 'I found 400 users using it this way' is a signal.
Common mistakes to avoid
Treating the unexpected use case as a problem to solve rather than a discovery to share — the community wants your genuine reaction, not a crisis management response.
Being vague about the unexpected use case to create mystery — some vagueness works in titles, but the post body needs to actually reveal the use case or readers feel cheated.
Using this format to indirectly promote your product — the unexpected use case should be the star, not your product features.
Pro tips
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