Try to keep it under 50 chars. Try to stick to ASCII printed characters (U+0000-U+007F or see the list): !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRST UVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~
Nothing visibly happens (besides Scratch Cat talking and being excited). It just listens and remembers.