[[Two men are sitting. A yellow buggy passes by.]]
Man 1: Punch buggy yellow. No punch back!
Man 2: <<Punch>>
Man 1: I said no punch back!
Man 2: You can do that?
Man 2: This changes _everything_.
Soon...
[[A blue buggy passes by.]]
Man 2: Sleep with your girlfriend buggy blue!
Man 1: Hey!
Man 2: No complaining back!
Man 1: Aww...
{{Title text: I never understood why someone would expect me to accept their rules right after they'd punched me.  I'm sure it's all very symbolic or something.}}