I have an excellent example of this. I worked at a small technical training company in early 2001. We had an in house application which was used for scheduling

I have an excellent example of this. I worked at a small technical training company in early 2001. We had an in house application which was used for scheduling classes. If you entered a trailing space the program would beep 3 times and display a dialog box warning you in capital letters that trailing spaces would corrupt the database. The button to close the dialog box was labeled "I understand and will obey". It probably took the developer more time to create the dialog box than to sanitize all inputs.