Hun: Why do you keep doing that?! Who are you talking to?THERE'S NO ONE THERE!!!"
Mikey and the 1980's turtles battle cries.
Leonardo: Uh... so, how do you guys normally handle these situations?
1987 Turtles: Turtle Power!
Michelangelo: Don't ya just love these guys? Cowabunga! *joins along with the 1987 Turtles*
1987 Turtles: Cowabunga!
Raphael: *moans* Geez, it's like having Five Mikeys now!
How about people being attacked by a giant walking-talking banana. That's right a giant BANANA, I know... weird.
The two Mikey's banter in battle.
87 Mikey: Cool off, dude.
03 Mikey: Cool off he says.
One of the cut scenes features the two teams (mostly just Raphael on the 2003 team's part) arguing about which Shredder caused the problem in the first place. Casey and April's expressions say everything that needs to be said, topped with this line from Casey:
"Your doubles ain't exactly playin' with a full deck, are they?"
This is funny in itself, given that 1987 Casey was essentially Harry Callahan in hockey gear.
The 87 Turtles upon returning to their dimension.
87 Leo: But first, we have to save April!
87 Don: We save April at least once a day.
"Wait! Come back with my command chair!"
The 87 & 03 Turtles get rid of Shredder-Prime... By pelting him with rubbish & knocking him off the rooftop they were on.
In the first appearance of the Turtles-Prime, while they're attacking their inter-dimensional counterparts, we get this exchange:
Leo-Prime: (narrating) I strike two on my way down. Donatello takes out a third with his staff. Already, the pudgy ones are starting to panic. Raph loves this stuff. He's not alone.
03 Don: Why is he narrating? Is he crazy?
03 Mikey: Hardcore crazy.
03 Raph: I love these guys!
This line from Krang when the Utrom Shredder uses the Technodrome's multiverse viewer:
Ch'rell is visibly scared when the Mirage Turtles are on his window in his armor; take into account that the Mirage Turtles scared the crap out of the most dangerous Shredder out of the core three. Actually when you take it quite literally, this Shredder is the most dangerous Shredder "period" that has or ever will exist. Because no Shredder could make a plan that could outdo destroying all reality