Find a pencil that's as slippery as your average seductress.
Step 2: Add the right amount of poison
This is where things get tricky. You see, not just any poison will do. No, no, no. You need something that'll leave no trace, no trail, no nothing.
Step 3: Wait for the desired effect
And, voilà! Your enemy is now a goner. Or, as we like to say, 'gone-ier'.
Method 3: The Classic Over-the-Shoulder
Or, if you'd like to try something different, you could also try Method 1: A Simple Slit in the Wall