[LarryPage]

So instead of just typing your password, you prefer to wiggle your mouse first, and then start typing your password?

[Too]

Yes. Because then I know I'm actually typing into the password box and not the username box which will be shown in plaintext once the monitor wakes up.

[Izkata]

Or more importantly, checking that the screen actually locked and didn't just turn off. You could be about to broadcast your password in a chat.

[LarryPage]

Then press enter, and then type in your password.