Leo, Donnie, Raph and Mikey were celebrating after defeating Winters' immortal stone statues generals, Gato, Serpiente, Mono, Aguila. And Raphael got rid of his alter ego "Nightwatcher", so did Mikey, got rid of his "Cowabunga Carl".

They were now in their lair, in the sewers.

Mikey: damn right, we did it, baby! I was cool as ever then, bros! Just like all of you! This was a job for the teenage mutant ninja turtles!

Raph was annoyed

Raph Sheesh, Mikey. This ain't a cartoon for you.

Mikey: but Raph! It was great! Wasn't it?

Raph: yeah, but it would have been cooler without your comments.

Mikey: Haha. Wrong. My comments only add activity to our battles.

Leo: Mikey. We are ninjas, and ninjas don't make jokes or comments during battle.

Raph grumbled: oh, here we go again, Splinter jr.

Mikey: but Leo, we are teenagers and we all like to have fun. So it wouldn't be fun without comments.

Donnie: Guys! Can you keep it down? I'm working on the computer here!

Raph: oh, forgive us, Mr. Einstein

He said sarcastically

Donnie: For your information, Einstein wasn't working on a computer, he was a physicist, Raph.