step 1: find a moderately heavy object with a nice sturdy handle. try swinging it around a few times - see if it feels right. be sure you get the full potential, as you want a '1-hit-ko' effect.
step 2: work on your stealth skills. you want to be able to walk around silently like a ninja. once you've mastered this, work on moving in a silent fashion while carrying said object mentioned in step 1.
step 3: once you complete steps 1 and 2, it's time to find yourself a nice target (ie. hot chick). I'm pretty sure you can figure out the rest from here. Be creative.
...Once you complete all three steps, post back on how it went in complete detail.
thanks in advance.
-your best friend Jason