This could go in the Crowning Moment of Funny folder just as well, but really, look at Ch'rell's reaction when the comic turtles latch onto his visor... thing. He's freaking out! Ch'rell is freaking out.
Mirage Raphael calling Shredder a coward.
Mirage Raphael: Shredder! Do you fear us?! (grinning maliciously)
2003 Shredder: (beat, eyes glowing red in response)
Which just goes to show...
2003 Leo: If there's one constant in the multiverse, it's the Shredder's BIG FAT EGO.
The Enemy Mine between the three teams of Turtles and 1987 villains certainly counts.
Exploding Throwing Stars...never leave home without'em.