I love this cartoon from xkcd, it really emphasizes why you need to screen your data inputs to protect against SQL Injection Attacks.
Image may be NSFW.
Clik here to view.
By the way, there’s a WebLog Awards going on right now, if you also enjoy xkcd give them a vote. http://2007.weblogawards.org/polls/best-comic-strip-1.php Hurry though, voting ends November 8th.
Image may be NSFW.
Clik here to view.

Clik here to view.

Clik here to view.

Clik here to view.
