the four turtles were hopping around the buildings with ease, not assuming that no one would be awake at such a time, especially on a building.

Michelangelo: Cowabunga dude!! We're, like, gliding!!

Leonardo: Focus, Michelangelo. You might fall!

Raphael: He's already fallen to the lowest point in intelligence, I don't think he can go much further...

Donatello: Ugh, don't you ever stop, Raphael..?