Choose 3 items to spank yourself with.

Put your underwear around your ankles whilst you spank yourself 10 times with each of these items.

are you have 123 in your name, spread 123 spanks across your body as you see fit, but once you start you cannot stop and if you pause for a couple of seconds you have to restart.

Roll a dice, now take your current post count. Multiply the 2 numbers.
Find your favorite spanking instrument and give this many seats to each butt cheek.