Yes, I am a ninja.
3 seconds sound clip from the Beverly Hills Ninja movie soundboard.
You can hear this line at 00:26:11 in the Blu-ray version of the movie.
Quote context
[...]
- What you got in here, man? Car radios?
- Here you go, sir. Welcome to the Rodeo Plaza Hotel.
- What are you, a spy or somethin'?
- A spy? A spy is like a gnat compared to a ninja.
- Ninja? You're a ninja? Get outta here! You're a ninja!
- Very admirable. Then perhaps you will know what these are.
- Man, that was dope! What are you, like a third-degree black belt?
- The blackness of my belt is like the inside of a coffin on a moonless night.
[...]