you had been great friends with the turtles friend for a long time now. Probably because you were partially mutant, with A (pick animal) tail and ears. You guys were making your escape (at least trying to) from Superfly. Mondo was on the back of the van

Mondo: Yo! You guys pushed out of the front of that van! That was not cool man!

Mikey: I'm so sorry, we had to!

Mondo: Y'know what? I don't accept that apology!

Raph: Yea, I'm not really sorry, honestly.

Raph said, kicking the back doors open, forcing Mondo to hold on to the door handle for dear life