[the Turtles are caught on TV during a battle with Muckman]
Splinter: How could you all be so careless? Secrecy is the most important rule of the ninja, and you have broken it. You four are forbidden from leaving the lair.
Raphael: What? You can't hold that sloppy escape against us. We got slimed with toxic puke!
Splinter: Silence!
Donatello: But sensei, if that pile of muck took us down, you know he's dangerous.
Leonardo: Which means we need to be out there looking for him.
Splinter: No. Until I decide I can trust you to watch yourselves, you will remain here. Grounded!
Raphael, Donatello, Leonardo, Michelangelo: Awww!
Michelangelo: [crawls towards the TV] Aw, yeah. Crognard marathon.
Splinter: And no TV.
[smashes the TV]