Ralph (or Victoria... I mean... your computer) can talk to you using a simple terminal command as this one:
say -v Victoria "This is so useful"
And for a countdown, just do this:
for V in 9 8 7 6 5 4 3 2 1 "Happy birthday master";
say -v Ralph $V;
Try the other (sexy) voices that can be listed as follow:
say -v ?
You'll never feel lonely now. Happy ?