Many, many years ago I was standing outside of a Petco store having a cigarette before going in to shop. While I was standing around, two immense she-boons at the payphone outside of the store broke into an argument.
For the most part, I was able to tune out their niggerbabble and go about getting my nicotine fix in peace. But one of the sows eventually hurled an insult at the other one that penetrated my psyche to the point where I can still remember it to this day:
"YO MOMMA SO FAT SHE STUPID!"
I still remember my response upon hearing that: a half-second of processing, followed by hysterical laughter. It did have the side effect of causing both of the mammies to stop arguing, look at me in bewilderment, and subsequently wander off while ooking and eeking at each other, so that was a plus.