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 upper case 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