Shredder: Is there a reason why you don’t take anything seriously?
Fishface: Jokes are a classic defense mechanism for someone with a traumatic childhood.
Shredder: Would you like a traumatic adulthood?
Fishface: I would not. 
seen from United Kingdom
seen from China
seen from China
seen from United States
seen from United States
seen from Mexico
seen from Namibia
seen from China
seen from Egypt
seen from Malaysia
seen from China
seen from United States
seen from Morocco
seen from United States
seen from Netherlands
seen from United States
seen from Netherlands
seen from Brazil
seen from Uzbekistan
seen from Israel
Shredder: Is there a reason why you don’t take anything seriously?
Fishface: Jokes are a classic defense mechanism for someone with a traumatic childhood.
Shredder: Would you like a traumatic adulthood?
Fishface: I would not. 
The GameCube game: It's Chuckola Cola.
The Switch remake: It's Chuckola Cola.
The internal files:
School counselor: So, tell me about your family.
Damian: I was raised by warrior-monks who spoke only the language of the blade.
(Early days)
Clark: oh, complain, complain. You know when life gives you lemons…
Batman: I complain about the lemons!
Dawn: I have made the decision to trust you.
Bog King: A horrible decision, really.
(source: Tangled)
Shredder: What’s the idea of letting that guy pick on you?! That’s MY job!!
Splinter: What?
Shredder: Don’t try to deny it! I’ve seen the whole thing! 
Splinter: You got it all wrong. I wasn’t-
Shredder: Do you hate him more than me?
Splinter: What? No! Saki, you’re the worst. I disliked you the moment I first laid eyes on you.
Shredder: Aww!
Onmund, after Ancano takes the Eye of Magnus and tries to blow up the College: We're dead! We're dead! We survived but we're dead!
THE FOLLOWING CONTENT IS RATED AS 'NOT SAFE FOR WADDLES'
you have been warned. Yet nothing can prepare you for this.
source