"Oh is this the part where you and I are supposed to put aside our differences to fight a common enemy? Nah, not interested chumps, have fun, I'll just go karting and see you next week." - Bowser
Mario: Mama mia, you wouldn't believe the amount of fan-mail I received today!
Luigi: And for Luigi...?
Mario: Let's see... Mario... to Mario.... Mario. For Mario. Hmm here's a smudge here, no.... to Mario. Oh, my.
Luigi: Ehhhh...
Mario: Maybe some of them were for you, bro, but they didn't realize it was you.
Wario: Yahoe. Here's my stupid friend, Waluigi. I had to tie his shoes for him. Say hello to these chumps, Waluigi.
Waluigi: Shaddap
"Mamma mia, could you please stop killing so many me's with your lack of skills?" - Mario in S8-Crown (SM3D Land) which I just beat. It took me a few tries, to say the least.