What I am assuming Taharo is asking is some sort of random message generator along the lines of:
The Ruby thingie chooses a random number from x to y. Then you assign the strings to each of those values...
So if the random numbers would be from 1 to 5, you assign the strings to 1-5, or something like that. And the configuration would be able to change the random numbers the script selects through the Call Script function...and be able to launch it from the Call Script function.
I know no sense of Ruby so this is a poor explanation.
It's either that up there what Taharo means, or he means truly random messages that are computer gibberish/infinite words, which indeed, is highly unlikely to achieve on RMXP (It's too primitive).
@Blizz: