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

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

F3, what else?

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

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

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.

I just open it.

I giggle the mouse.

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 :]

I mash the keyboard. It wakes.

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

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

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

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!

I just drop my schweaty balls on the keyboard