I mash the keyboard. It wakes.

I thump my water bottle down on the desk just hard enough to make my mouse trigger and wake up the PC. By the time I'm sat comfortably it's awaiting a password :]

Right arrow. Wake on mouse disabled because cats. Right arrow is on the bottom right corner and convenient to hit when pulling the keyboard tray out.

Control. I'm mildly paranoid any other key will actually go through and type/do something.

If there is a pin set, decimal on the numpad, else Ctrl or ESC.

I also use Ctrl, or I waggle my mouse to wake both it and my PC (it's wireless).

F3, what else?

Arrow up. Multiple times.

The first letter of my password.

The power button

Esc, t, or I move the mouse. Depends on my goal when I'm waking it up.

I use numlok mostly. I guess I’m weird!

SPACE bar

I use a arrow key, usually the arrow to the right

None! And the sucker still wakes up all the time.

Ctrl+Alt+delete for my work computer so I can go straight to password input.
Space for my home computer.

I slap the spacebar, often multiple times if I'm impatient

Am I the only one that just kind throws my hand on the keyboard and what happens happens?

Alt