Splinter, Mikey and others in “Unfinished Business”

My son, I sense there is something you would like to tell us.

What? No, not at all. Really, I didn't do anything. [gives in] Okay, okay! You got me! I kinda... I sprinkled a little... [pulls out a vial of mutagen] mutagen on my skin.

[shocked and furious] WHAT?! ARE YOU KIDDING?! WHY?!

To become better! Cooler, you know? You guys treat me like a big goofball all the time! So I found this vial in Donnie's lab. The label says it'll make you super cool.

[turns the vial around, showing that "cool" is actually "cooled"] No, it says you're supposed to keep it super cooled, as in TEMPERATURE!!! This was a reject-batch of retro-mutagen, Mikey! It's DANGEROUS!

Well, you could've made it a little more clear! [Donnie turns the vial around to show many warning labels] Still not that clear.