Raph, Leo and others in “Unfinished Business”

I'm tired of training with kid gloves. No one's pulling punches out there. Why should we do it in here? (Pushes Leo away)

Raph!

Teishi, because you are brothers and your goal here is to train.

(groans) Sensei, why do you always stick up for Leo? I'm the only one who takes training seriously. The rest of 'em are just goofing off all the time.

(mimics) "No one appreciates me." Back on the "Everyone loves Leo" routine? Get some new material, you big baby.

(Laughs)

How many times has he quit the team now?

Twenty-seven times.

You have a brilliant mind, Donatello. Yet you see a fire and try to put it out with gasoline. You are growing up, my sons, and you must become more mature. One day I will not be around to remind you of your foibles.

Is foible that dangly thing that hangs at the back of my throat?

Foible means "weakness of character," shell brain!

Master, you've made it through the worst of the worst. And we're never gonna let-

Everything isn't permanent, Leonardo. You cannot expect anything to last forever, even...family.