Best…Pirate…quotation…EVAAAAAHH! 
However, I cannot find any quotes about Ninja worth the freckles on a Gossamar-Winged Spitoon Fly. 
Find me stylish quotations about Ninja.
If you cannot, about Pirates.
Best if you can do both.
“Wise man say, ‘Forgiveness is divine, but never pay full price for late pizza.’”
- Michelangelo
BTW—
http://dailytroll.com/images/ninja.jpg
The above is purportedly a real sign, seen in Montana.
I have no explaination for this. 
Montana Dopers? Enhance, please?
Obviously, people in Montana have a thing for ninjas. I can’t blame ‘em.
They’re pretty friggin’ sweet.
I love them with my whole body (even my pee pee).
From one of the old Samurai Cat books ( no, not the pizza ones; older ) :
“It’s a Hollywood Ninja !”
“How can you tell ?”
“It’s underground, and he’s wearing all white. If it was outside in the snow, he’d be wearing all black.”
From memory, in The Wizardry Cursed :
“I think that was . . . a ninja dwarf.”
“That sounds like something from a D&D campaign.” He paused, and thought about it. “A bad D&D campaign.”