"Finally. At last. The moment I've been training for."
Seriously. You don't even want to know what those piranhas are planning to do when they time travel. (I don't think he will become his own grandfather. Just sayin'.) So keep on writing! Whether you're doing NaNoWriMo or you are working at your own pace, keep at it! If you stop, 1) The terrorists win, and 2) Piranhas will gain the secret of time travel (see #1).
What do YOU think piranhas would do if they could travel through time?
a) Eat a bite of every American president?
b) Enjoy the giant, moving smorgasbord known as The Dinosaur Kingdom?
c) Establish an empirical piranha colony on the moon?
d) OTHER! (Leave your guess in the comments section!)