Ninjas

"Ninjas are masters of disguise and have ninja-like reflexes. So, it's imperative that you are very careful around ninjas."

"But, how do you know when there are ninjas around?"

"You don't know. You have to be careful all the time!"

"Umm..."

"If you ever see half-a-dozen ninjas, it's because they want you to!"

"Uhh..."

"And there'd probably be another half-a-dozen hiding nearby. Very nearby."

"Hey, umm, i...."

"What?"

"Is that a ninja?"

* looks around *

"Where?"