How do I enter the passcode when I CAN'T?!

Ok, so, I'm not even sure why or how this happened. I plugged my iPhone 3GS (version 3.1.2) into the wall charger last night, and this morning it's displaying the plug into iTunes symbol. I plugged it in, and it says, "iTunes could not connect to the iPhone "________" because it is locked with a passcode. You must enter your passcode on the iPhone before it can be used with iTunes."

I simply cannot get any type of passcode-entering goodness to appear on my iPhone.

WHY? Please help me! My precious iPhone is out of commission

 

Nevermind!

Hahaha. I just restarted it and it's fine now.