When writing code for end users, what operator error always surprises you?

• double-clicking on html pages
• incorrect data (date/number/etc) formatting
• not submitting all the required input
• not reading the detailed instructions I've apparently wasted my time writing
• not understanding the detailed instructions I've apparently wasted my time writing
• not seeing the detailed instructions in flashing uppercase red letters on the screen I've apparently wasted my time writing
• I never know what crazy stunt they'll come up with next
• Nothing...my code is smarter than the dumbest user
• Nothing...I don't care
• What end users? All my code is automated.
• other

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