Different people have different ways of dealing with their anger. But I think many people would agree that a carefully crafted note wins the award for "most entertaining"—at least for those uninvolved in the fracas.
And the internet is the obvious hotspot for people to post their favorite examples of this particular form of passive aggressiveness.
Check out some of the best and most creative examples (and take notes if this is your way of settling disputes).
"Get your own cat instead of taking mine! Leave her outside. Please. Seriously. Please stop encouraging her, Thank you for listening to me."