That sign won’t stop me, because I can’t read!
$ man ls | spd-say -e
EDIT: If you run the above, it looks like speech-dispatcher splits the thing up into a bunch of different consecutive blocking requests, which means that it’s a pain in the neck to stop with a single command. You might want to leave while true; do spd-say -S; done
running for a bit to make it actually stop talking.
If you’re not familiar, there’s a
chsh
command.