• Can I make it smaller/simpler?
• What will the "idiot" user do?
• What will the cracker do?

I like to make my code smaller, more elegant and more modular, I shudder when I look at how bloated and spagetti like my early code is, and even today, I'd hardly call my code compact...

Much of my stuff is small CGI scripts, so I'm very worried about black-hats and people doing stupid things.

I can see a lot of validity in what other people have said here ++ all around, but I suppse I worry about: Reuse; Misuse; and Abuse.