I was 'attitude' in this place before it was a catchphrase!
I particularly like the catchphrase of Leonardo Da Vinci: Ostinato Rigore! (Which means, pretty much, Relentless Rigor).
The women in my family are all super-emotional. The catchphrase in our family is 'Listen to my words, not my tears.
A superhero's catchphrase should be like a really memorable advertising slogan. It sticks in your head and you can't stop humming it. And let's face it, superheroes are just really selling themselves as products.
You're nothing but an apple, a silly t-shirt, a catchphrase and a stupid haircut.