I did this once on a message board, and it was pretty fun. Someone started a story with a ten word line, and we each added ten more words as we went along. I'll get it started. Use whatever AA you like.
@ ÈQÈ @@^PPPPPPPPPPPPPPPPPPPPP @i@EÍEjƒ Once upon a time, this guy was watching TV, when... @i@@@@j @_QQQQQQQQQQQQQQQQQQQQQ @b b@| @i_QjQj
@@,,,,,,,,,,,, @Ð,,,,,,,,;;,;;,Ð @^PPPPPPPPPPPPPPPPPPPPPPP @i@K_TKj ƒ Right for the Canadaian coast, eh? But the real news... @i@ @|@j @ _QQQQQQQQQQQQQQQQQQQQQQQ @b b@| @i_QjQj
@@,,,,,,,,,,,, @Ð,,,,,,,,;;,;;,Ð @^PPPPPPPPPPPPPPPPPPPPPPP @i@K_TKj ƒ Thanks for the interruption, eh? Anyway, I ran out of... @i@ @|@j @ _QQQQQQQQQQQQQQQQQQQQQQQ @b b@| @i_QjQj
@@@@@@@@@Ð@e @ f_ @@@@@@@ƒi@@@QQ_/ @@@@@@ ƒi@@ƒmÉÉÉ @@@@@@ƒi@@ _( ß„Dß)@But a man dressed in black stopped me and said... i_@@@ƒi@@@¹PP¿ (@ÜÜÜÜi@@@@@@ ) @_QQQiQQ)ÎQ)Î
@@,,,,,,,,,,,, @Ð,,,,,,,,;;,;;,Ð @^PPPPPPPPPPPPPPPPPPPPPPP @i@K_TKj ƒ But then, the hurricaine hit Nova Scotia and all the... @i@ @|@j @ _QQQQQQQQQQQQQQQQQQQQQQQ @b b@| @i_QjQj
@ ÈQÈ @@^PPPPPPPPPPPPPPPPPPPPPPP @i@L_½Mjƒ ...poutine was washed out to sea, to the secret relief of every gourmet on Earth. And then... @i@@@@j @_QQQQQQQQQQQQQQQQQQQQQQQ @b b@| @i_QjQj