Re^2: When writing code for end users, what operator error surprises you the most?

[girarde]

That's why when the end user might possibly be someone other than me there's a ton of input validation.

Sometimes even when it is only me.

[ChuckularOne]

When it's just for me I use rude/sarcastic error messages.

That ends up being bad when (on occasion) I convert a script I originally intended for personal use to one for general use and forget to update the error messages.